diff --git a/.gitignore b/.gitignore
index 71fd2246..f42d6fe9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,80 @@
 coverage/
 node_modules/
 .DS_Store
+/packages/remark-lint/*.d.ts
+/packages/remark-lint-blockquote-indentation/*.d.ts
+/packages/remark-lint-checkbox-character-style/*.d.ts
+/packages/remark-lint-checkbox-content-indent/*.d.ts
+/packages/remark-lint-code-block-style/*.d.ts
+/packages/remark-lint-definition-case/*.d.ts
+/packages/remark-lint-definition-spacing/*.d.ts
+/packages/remark-lint-emphasis-marker/*.d.ts
+/packages/remark-lint-fenced-code-flag/*.d.ts
+/packages/remark-lint-fenced-code-marker/*.d.ts
+/packages/remark-lint-file-extension/*.d.ts
+/packages/remark-lint-final-definition/*.d.ts
+/packages/remark-lint-final-newline/*.d.ts
+/packages/remark-lint-first-heading-level/*.d.ts
+/packages/remark-lint-hard-break-spaces/*.d.ts
+/packages/remark-lint-heading-increment/*.d.ts
+/packages/remark-lint-heading-style/*.d.ts
+/packages/remark-lint-linebreak-style/*.d.ts
+/packages/remark-lint-link-title-style/*.d.ts
+/packages/remark-lint-list-item-bullet-indent/*.d.ts
+/packages/remark-lint-list-item-content-indent/*.d.ts
+/packages/remark-lint-list-item-indent/*.d.ts
+/packages/remark-lint-list-item-spacing/*.d.ts
+/packages/remark-lint-maximum-heading-length/*.d.ts
+/packages/remark-lint-maximum-line-length/*.d.ts
+/packages/remark-lint-no-auto-link-without-protocol/*.d.ts
+/packages/remark-lint-no-blockquote-without-marker/*.d.ts
+/packages/remark-lint-no-consecutive-blank-lines/*.d.ts
+/packages/remark-lint-no-duplicate-defined-urls/*.d.ts
+/packages/remark-lint-no-duplicate-definitions/*.d.ts
+/packages/remark-lint-no-duplicate-headings/*.d.ts
+/packages/remark-lint-no-duplicate-headings-in-section/*.d.ts
+/packages/remark-lint-no-emphasis-as-heading/*.d.ts
+/packages/remark-lint-no-empty-url/*.d.ts
+/packages/remark-lint-no-file-name-articles/*.d.ts
+/packages/remark-lint-no-file-name-consecutive-dashes/*.d.ts
+/packages/remark-lint-no-file-name-irregular-characters/*.d.ts
+/packages/remark-lint-no-file-name-mixed-case/*.d.ts
+/packages/remark-lint-no-file-name-outer-dashes/*.d.ts
+/packages/remark-lint-no-heading-content-indent/*.d.ts
+/packages/remark-lint-no-heading-indent/*.d.ts
+/packages/remark-lint-no-heading-like-paragraph/*.d.ts
+/packages/remark-lint-no-heading-punctuation/*.d.ts
+/packages/remark-lint-no-html/*.d.ts
+/packages/remark-lint-no-inline-padding/*.d.ts
+/packages/remark-lint-no-literal-urls/*.d.ts
+/packages/remark-lint-no-missing-blank-lines/*.d.ts
+/packages/remark-lint-no-multiple-toplevel-headings/*.d.ts
+/packages/remark-lint-no-paragraph-content-indent/*.d.ts
+/packages/remark-lint-no-reference-like-url/*.d.ts
+/packages/remark-lint-no-shell-dollars/*.d.ts
+/packages/remark-lint-no-shortcut-reference-image/*.d.ts
+/packages/remark-lint-no-shortcut-reference-link/*.d.ts
+/packages/remark-lint-no-table-indentation/*.d.ts
+/packages/remark-lint-no-tabs/*.d.ts
+/packages/remark-lint-no-undefined-references/*.d.ts
+/packages/remark-lint-no-unneeded-full-reference-image/*.d.ts
+/packages/remark-lint-no-unneeded-full-reference-link/*.d.ts
+/packages/remark-lint-no-unused-definitions/*.d.ts
+/packages/remark-lint-ordered-list-marker-style/*.d.ts
+/packages/remark-lint-ordered-list-marker-value/*.d.ts
+/packages/remark-lint-rule-style/*.d.ts
+/packages/remark-lint-strikethrough-marker/*.d.ts
+/packages/remark-lint-strong-marker/*.d.ts
+/packages/remark-lint-table-cell-padding/*.d.ts
+/packages/remark-lint-table-pipe-alignment/*.d.ts
+/packages/remark-lint-table-pipes/*.d.ts
+/packages/remark-lint-unordered-list-marker-style/*.d.ts
+/packages/remark-preset-lint-consistent/*.d.ts
+/packages/remark-preset-lint-markdown-style-guide/*.d.ts
+/packages/remark-preset-lint-recommended/*.d.ts
+/packages/unified-lint-rule/lib/*.d.ts
+/script/**/*.d.ts
+/*.d.ts
 *.log
 package-lock.json
 yarn.lock
diff --git a/package.json b/package.json
index b401e40b..01ca3d16 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,10 @@
   ],
   "type": "module",
   "devDependencies": {
+    "@types/mdast": "^3.0.0",
+    "@types/parse-author": "^2.0.0",
+    "@types/pluralize": "^0.0.29",
+    "@types/tape": "^4.0.0",
     "c8": "^7.0.0",
     "comment-parser": "^1.0.0",
     "lerna": "^4.0.0",
@@ -46,22 +50,27 @@
     "remark-github": "^11.0.0",
     "remark-toc": "^8.0.0",
     "remark-validate-links": "^11.0.0",
+    "rimraf": "^3.0.0",
     "strip-indent": "^4.0.0",
     "tape": "^5.0.0",
     "to-vfile": "^7.0.0",
+    "type-coverage": "^2.0.0",
+    "type-fest": "^2.0.0",
+    "typescript": "^4.0.0",
     "unist-builder": "^3.0.0",
     "unist-util-remove-position": "^4.0.0",
     "xo": "^0.39.0"
   },
   "scripts": {
     "postinstall": "lerna bootstrap --no-ci",
+    "build-packages": "node script/build-presets && node script/build-rules",
+    "build-workspace": "lerna run build",
+    "build-monorepo": "rimraf \"test.d.ts\" \"script/**/*.d.ts\" && tsc && type-coverage",
+    "build": "npm run build-packages && npm run build-workspace && npm run build-monorepo",
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "generate:presets": "node script/build-presets",
-    "generate:rules": "node script/build-rules",
-    "generate": "npm run generate:presets && npm run generate:rules",
     "test-api": "node --conditions development test.js",
     "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov npm run test-api",
-    "test": "npm run generate && npm run format && npm run test-coverage"
+    "test": "npm run build && npm run format && npm run test-coverage"
   },
   "prettier": {
     "tabWidth": 2,
@@ -88,5 +97,11 @@
         }
       }
     ]
+  },
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
   }
 }
diff --git a/packages/remark-lint-blockquote-indentation/index.js b/packages/remark-lint-blockquote-indentation/index.js
index 0a6656ae..e78955d4 100644
--- a/packages/remark-lint-blockquote-indentation/index.js
+++ b/packages/remark-lint-blockquote-indentation/index.js
@@ -48,6 +48,12 @@
  *   9:3: Add 1 space between block quote and content
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').Blockquote} Blockquote
+ * @typedef {'consistent'|number} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import plural from 'pluralize'
 import {visit} from 'unist-util-visit'
@@ -56,41 +62,42 @@ import {generated} from 'unist-util-generated'
 
 const remarkLintBlockquoteIndentation = lintRule(
   'remark-lint:blockquote-indentation',
-  blockquoteIndentation
-)
-
-export default remarkLintBlockquoteIndentation
-
-function blockquoteIndentation(tree, file, option) {
-  let preferred = typeof option === 'number' ? option : null
-
-  visit(tree, 'blockquote', (node) => {
-    if (generated(node) || node.children.length === 0) {
-      return
-    }
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
+    visit(tree, 'blockquote', (node) => {
+      if (generated(node) || node.children.length === 0) {
+        return
+      }
 
-    if (preferred) {
-      const diff = preferred - check(node)
+      if (option === 'consistent') {
+        option = check(node)
+      } else {
+        const diff = option - check(node)
 
-      if (diff !== 0) {
-        const abs = Math.abs(diff)
+        if (diff !== 0) {
+          const abs = Math.abs(diff)
 
-        file.message(
-          (diff > 0 ? 'Add' : 'Remove') +
-            ' ' +
-            abs +
-            ' ' +
-            plural('space', abs) +
-            ' between block quote and content',
-          pointStart(node.children[0])
-        )
+          file.message(
+            (diff > 0 ? 'Add' : 'Remove') +
+              ' ' +
+              abs +
+              ' ' +
+              plural('space', abs) +
+              ' between block quote and content',
+            pointStart(node.children[0])
+          )
+        }
       }
-    } else {
-      preferred = check(node)
-    }
-  })
-}
+    })
+  }
+)
 
+export default remarkLintBlockquoteIndentation
+
+/**
+ * @param {Blockquote} node
+ * @returns {number}
+ */
 function check(node) {
   return pointStart(node.children[0]).column - pointStart(node).column
 }
diff --git a/packages/remark-lint-blockquote-indentation/package.json b/packages/remark-lint-blockquote-indentation/package.json
index 7ed8308d..0355bf3d 100644
--- a/packages/remark-lint-blockquote-indentation/package.json
+++ b/packages/remark-lint-blockquote-indentation/package.json
@@ -25,15 +25,28 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "pluralize": "^8.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-blockquote-indentation/readme.md b/packages/remark-lint-blockquote-indentation/readme.md
index d6d80d29..673c68a1 100644
--- a/packages/remark-lint-blockquote-indentation/readme.md
+++ b/packages/remark-lint-blockquote-indentation/readme.md
@@ -89,12 +89,18 @@ Paragraph.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-blockquote-indentation
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintBlockquoteIndentation`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -175,6 +181,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-blockquote-indentation/tsconfig.json b/packages/remark-lint-blockquote-indentation/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-blockquote-indentation/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-checkbox-character-style/index.js b/packages/remark-lint-checkbox-character-style/index.js
index 2a548f14..b134dcdd 100644
--- a/packages/remark-lint-checkbox-character-style/index.js
+++ b/packages/remark-lint-checkbox-character-style/index.js
@@ -77,49 +77,65 @@
  *   1:1: Incorrect checked checkbox marker `💩`: use either `'x'`, or `'X'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ *
+ * @typedef Styles
+ * @property {'x'|'X'|'consistent'} [checked='consistent']
+ * @property {' '|'\x09'|'consistent'} [unchecked='consistent']
+ *
+ * @typedef {'consistent'|Styles} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
-
-const checked = {x: true, X: true}
-const unchecked = {' ': true, '\t': true}
-const types = {true: 'checked', false: 'unchecked'}
 
 const remarkLintCheckboxCharacterStyle = lintRule(
   'remark-lint:checkbox-character-style',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
     const value = String(file)
-    const preferred = typeof option === 'object' ? option : {}
+    /** @type {'x'|'X'|'consistent'} */
+    let checked = 'consistent'
+    /** @type {' '|'\x09'|'consistent'} */
+    let unchecked = 'consistent'
 
-    if (preferred.unchecked && unchecked[preferred.unchecked] !== true) {
+    if (typeof option === 'object') {
+      checked = option.checked || 'consistent'
+      unchecked = option.unchecked || 'consistent'
+    }
+
+    if (unchecked !== 'consistent' && unchecked !== ' ' && unchecked !== '\t') {
       file.fail(
         'Incorrect unchecked checkbox marker `' +
-          preferred.unchecked +
+          unchecked +
           "`: use either `'\\t'`, or `' '`"
       )
     }
 
-    if (preferred.checked && checked[preferred.checked] !== true) {
+    if (checked !== 'consistent' && checked !== 'x' && checked !== 'X') {
       file.fail(
         'Incorrect checked checkbox marker `' +
-          preferred.checked +
+          checked +
           "`: use either `'x'`, or `'X'`"
       )
     }
 
     visit(tree, 'listItem', (node) => {
       const head = node.children[0]
+      const point = pointStart(head)
+
       // Exit early for items without checkbox.
       // A list item cannot be checked and empty, according to GFM.
-      if (typeof node.checked !== 'boolean' || generated(node) || !head) {
+      if (
+        typeof node.checked !== 'boolean' ||
+        !head ||
+        typeof point.offset !== 'number'
+      ) {
         return
       }
 
-      const type = types[node.checked]
-
-      const point = pointStart(head)
-
       // Move back to before `] `.
       point.offset -= 2
       point.column -= 2
@@ -133,21 +149,24 @@ const remarkLintCheckboxCharacterStyle = lintRule(
       /* c8 ignore next */
       if (!match) return
 
-      const style = preferred[type]
+      const style = node.checked ? checked : unchecked
 
-      if (style) {
-        if (match[1] !== style) {
-          file.message(
-            type.charAt(0).toUpperCase() +
-              type.slice(1) +
-              ' checkboxes should use `' +
-              style +
-              '` as a marker',
-            point
-          )
+      if (style === 'consistent') {
+        if (node.checked) {
+          // @ts-expect-error: valid marker.
+          checked = match[1]
+        } else {
+          // @ts-expect-error: valid marker.
+          unchecked = match[1]
         }
-      } else {
-        preferred[type] = match[1]
+      } else if (match[1] !== style) {
+        file.message(
+          (node.checked ? 'Checked' : 'Unchecked') +
+            ' checkboxes should use `' +
+            style +
+            '` as a marker',
+          point
+        )
       }
     })
   }
diff --git a/packages/remark-lint-checkbox-character-style/package.json b/packages/remark-lint-checkbox-character-style/package.json
index 920d29cd..7eb532b9 100644
--- a/packages/remark-lint-checkbox-character-style/package.json
+++ b/packages/remark-lint-checkbox-character-style/package.json
@@ -26,14 +26,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-checkbox-character-style/readme.md b/packages/remark-lint-checkbox-character-style/readme.md
index 6e807ef1..eb472e75 100644
--- a/packages/remark-lint-checkbox-character-style/readme.md
+++ b/packages/remark-lint-checkbox-character-style/readme.md
@@ -160,12 +160,18 @@ When configured with `{ checked: '💩' }`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-checkbox-character-style
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintCheckboxCharacterStyle`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -246,6 +252,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-checkbox-character-style/tsconfig.json b/packages/remark-lint-checkbox-character-style/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-checkbox-character-style/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-checkbox-content-indent/index.js b/packages/remark-lint-checkbox-content-indent/index.js
index 69795a79..996d0bf5 100644
--- a/packages/remark-lint-checkbox-content-indent/index.js
+++ b/packages/remark-lint-checkbox-content-indent/index.js
@@ -30,29 +30,36 @@
  *   4:7-4:10: Checkboxes should be followed by a single character
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {location} from 'vfile-location'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
 
 const remarkLintCheckboxContentIndent = lintRule(
   'remark-lint:checkbox-content-indent',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
     const loc = location(file)
 
     visit(tree, 'listItem', (node) => {
       const head = node.children[0]
+      const point = pointStart(head)
 
       // Exit early for items without checkbox.
       // A list item cannot be checked and empty, according to GFM.
-      if (typeof node.checked !== 'boolean' || generated(node) || !head) {
+      if (
+        typeof node.checked !== 'boolean' ||
+        !head ||
+        typeof point.offset !== 'number'
+      ) {
         return
       }
 
-      const point = pointStart(head)
-
       // Assume we start with a checkbox, because well, `checked` is set.
       const match = /\[([\t xX])]/.exec(
         value.slice(point.offset - 4, point.offset + 1)
diff --git a/packages/remark-lint-checkbox-content-indent/package.json b/packages/remark-lint-checkbox-content-indent/package.json
index 5eb12bb8..8fe5522c 100644
--- a/packages/remark-lint-checkbox-content-indent/package.json
+++ b/packages/remark-lint-checkbox-content-indent/package.json
@@ -26,15 +26,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0",
     "vfile-location": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-checkbox-content-indent/readme.md b/packages/remark-lint-checkbox-content-indent/readme.md
index 108bd1fa..34945006 100644
--- a/packages/remark-lint-checkbox-content-indent/readme.md
+++ b/packages/remark-lint-checkbox-content-indent/readme.md
@@ -58,12 +58,18 @@ Note: this example uses [GFM][].
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-checkbox-content-indent
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintCheckboxContentIndent`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -144,6 +150,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-checkbox-content-indent/tsconfig.json b/packages/remark-lint-checkbox-content-indent/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-checkbox-content-indent/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-code-block-style/index.js b/packages/remark-lint-code-block-style/index.js
index 74c13e04..31b6ff7f 100644
--- a/packages/remark-lint-code-block-style/index.js
+++ b/packages/remark-lint-code-block-style/index.js
@@ -101,52 +101,55 @@
  *   1:1: Incorrect code block style `💩`: use either `'consistent'`, `'fenced'`, or `'indented'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'fenced'|'indented'} Style
+ * @typedef {'consistent'|Style} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
 import {generated} from 'unist-util-generated'
 
-const styles = {null: true, fenced: true, indented: true}
-
 const remarkLintCodeBlockStyle = lintRule(
   'remark-lint:code-block-style',
-  codeBlockStyle
-)
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
+    const value = String(file)
 
-export default remarkLintCodeBlockStyle
-
-function codeBlockStyle(tree, file, option) {
-  const value = String(file)
-  let preferred =
-    typeof option === 'string' && option !== 'consistent' ? option : null
-
-  if (styles[preferred] !== true) {
-    file.fail(
-      'Incorrect code block style `' +
-        preferred +
-        "`: use either `'consistent'`, `'fenced'`, or `'indented'`"
-    )
-  }
-
-  visit(tree, 'code', (node) => {
-    if (generated(node)) {
-      return
+    if (
+      option !== 'consistent' &&
+      option !== 'fenced' &&
+      option !== 'indented'
+    ) {
+      file.fail(
+        'Incorrect code block style `' +
+          option +
+          "`: use either `'consistent'`, `'fenced'`, or `'indented'`"
+      )
     }
 
-    const initial = pointStart(node).offset
-    const final = pointEnd(node).offset
+    visit(tree, 'code', (node) => {
+      if (generated(node)) {
+        return
+      }
+
+      const initial = pointStart(node).offset
+      const final = pointEnd(node).offset
 
-    const current =
-      node.lang || /^\s*([~`])\1{2,}/.test(value.slice(initial, final))
-        ? 'fenced'
-        : 'indented'
+      const current =
+        node.lang || /^\s*([~`])\1{2,}/.test(value.slice(initial, final))
+          ? 'fenced'
+          : 'indented'
 
-    if (preferred) {
-      if (preferred !== current) {
-        file.message('Code blocks should be ' + preferred, node)
+      if (option === 'consistent') {
+        option = current
+      } else if (option !== current) {
+        file.message('Code blocks should be ' + option, node)
       }
-    } else {
-      preferred = current
-    }
-  })
-}
+    })
+  }
+)
+
+export default remarkLintCodeBlockStyle
diff --git a/packages/remark-lint-code-block-style/package.json b/packages/remark-lint-code-block-style/package.json
index c0245c91..08b8bf24 100644
--- a/packages/remark-lint-code-block-style/package.json
+++ b/packages/remark-lint-code-block-style/package.json
@@ -24,14 +24,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-code-block-style/readme.md b/packages/remark-lint-code-block-style/readme.md
index a1c96ba5..2aa06fdc 100644
--- a/packages/remark-lint-code-block-style/readme.md
+++ b/packages/remark-lint-code-block-style/readme.md
@@ -158,12 +158,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-code-block-style
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintCodeBlockStyle`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -244,6 +250,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-code-block-style/tsconfig.json b/packages/remark-lint-code-block-style/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-code-block-style/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-definition-case/index.js b/packages/remark-lint-definition-case/index.js
index ea9820ac..9b41aa54 100644
--- a/packages/remark-lint-definition-case/index.js
+++ b/packages/remark-lint-definition-case/index.js
@@ -22,32 +22,36 @@
  *   1:1-1:47: Do not use uppercase characters in definition labels
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
 
 const label = /^\s*\[((?:\\[\s\S]|[^[\]])+)]/
 
 const remarkLintDefinitionCase = lintRule(
   'remark-lint:definition-case',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
 
     visit(tree, (node) => {
-      if (
-        (node.type === 'definition' || node.type === 'footnoteDefinition') &&
-        !generated(node)
-      ) {
+      if (node.type === 'definition' || node.type === 'footnoteDefinition') {
         const start = pointStart(node).offset
         const end = pointEnd(node).offset
-        const slice = value.slice(start, end).match(label)[1]
 
-        if (slice !== slice.toLowerCase()) {
-          file.message(
-            'Do not use uppercase characters in definition labels',
-            node
-          )
+        if (typeof start === 'number' && typeof end === 'number') {
+          const match = value.slice(start, end).match(label)
+
+          if (match && match[1] !== match[1].toLowerCase()) {
+            file.message(
+              'Do not use uppercase characters in definition labels',
+              node
+            )
+          }
         }
       }
     })
diff --git a/packages/remark-lint-definition-case/package.json b/packages/remark-lint-definition-case/package.json
index 1e5a594a..d32cf901 100644
--- a/packages/remark-lint-definition-case/package.json
+++ b/packages/remark-lint-definition-case/package.json
@@ -24,14 +24,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-definition-case/readme.md b/packages/remark-lint-definition-case/readme.md
index 27528f19..5dbc9e8b 100644
--- a/packages/remark-lint-definition-case/readme.md
+++ b/packages/remark-lint-definition-case/readme.md
@@ -50,12 +50,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-definition-case
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintDefinitionCase`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -136,6 +142,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-definition-case/tsconfig.json b/packages/remark-lint-definition-case/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-definition-case/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-definition-spacing/index.js b/packages/remark-lint-definition-spacing/index.js
index 6af1c79b..252f8f9f 100644
--- a/packages/remark-lint-definition-spacing/index.js
+++ b/packages/remark-lint-definition-spacing/index.js
@@ -22,31 +22,36 @@
  *   1:1-1:57: Do not use consecutive whitespace in definition labels
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
 
 const label = /^\s*\[((?:\\[\s\S]|[^[\]])+)]/
 
 const remarkLintDefinitionSpacing = lintRule(
   'remark-lint:definition-spacing',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
 
     visit(tree, (node) => {
-      if (
-        (node.type === 'definition' || node.type === 'footnoteDefinition') &&
-        !generated(node)
-      ) {
+      if (node.type === 'definition' || node.type === 'footnoteDefinition') {
         const start = pointStart(node).offset
         const end = pointEnd(node).offset
 
-        if (/[ \t\n]{2,}/.test(value.slice(start, end).match(label)[1])) {
-          file.message(
-            'Do not use consecutive whitespace in definition labels',
-            node
-          )
+        if (typeof start === 'number' && typeof end === 'number') {
+          const match = value.slice(start, end).match(label)
+
+          if (match && /[ \t\n]{2,}/.test(match[1])) {
+            file.message(
+              'Do not use consecutive whitespace in definition labels',
+              node
+            )
+          }
         }
       }
     })
diff --git a/packages/remark-lint-definition-spacing/package.json b/packages/remark-lint-definition-spacing/package.json
index 5b5a9dca..e6158f39 100644
--- a/packages/remark-lint-definition-spacing/package.json
+++ b/packages/remark-lint-definition-spacing/package.json
@@ -24,14 +24,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-definition-spacing/readme.md b/packages/remark-lint-definition-spacing/readme.md
index 81bad1b0..91e26f51 100644
--- a/packages/remark-lint-definition-spacing/readme.md
+++ b/packages/remark-lint-definition-spacing/readme.md
@@ -52,12 +52,18 @@ Note: `·` represents a space.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-definition-spacing
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintDefinitionSpacing`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -138,6 +144,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-definition-spacing/tsconfig.json b/packages/remark-lint-definition-spacing/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-definition-spacing/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-emphasis-marker/index.js b/packages/remark-lint-emphasis-marker/index.js
index b774d4ff..13eef19a 100644
--- a/packages/remark-lint-emphasis-marker/index.js
+++ b/packages/remark-lint-emphasis-marker/index.js
@@ -69,41 +69,40 @@
  *   1:1: Incorrect emphasis marker `💩`: use either `'consistent'`, `'*'`, or `'_'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'*'|'_'} Marker
+ * @typedef {'consistent'|Marker} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
-
-const markers = {null: true, '*': true, _: true}
 
 const remarkLintEmphasisMarker = lintRule(
   'remark-lint:emphasis-marker',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
     const value = String(file)
-    let preferred =
-      typeof option === 'string' && option !== 'consistent' ? option : null
 
-    if (markers[preferred] !== true) {
+    if (option !== '*' && option !== '_' && option !== 'consistent') {
       file.fail(
         'Incorrect emphasis marker `' +
-          preferred +
+          option +
           "`: use either `'consistent'`, `'*'`, or `'_'`"
       )
     }
 
     visit(tree, 'emphasis', (node) => {
-      if (!generated(node)) {
-        const marker = value.charAt(pointStart(node).offset)
+      const start = pointStart(node).offset
+
+      if (typeof start === 'number') {
+        const marker = /** @type {Marker} */ (value.charAt(start))
 
-        if (preferred) {
-          if (marker !== preferred) {
-            file.message(
-              'Emphasis should use `' + preferred + '` as a marker',
-              node
-            )
-          }
-        } else {
-          preferred = marker
+        if (option === 'consistent') {
+          option = marker
+        } else if (marker !== option) {
+          file.message('Emphasis should use `' + option + '` as a marker', node)
         }
       }
     })
diff --git a/packages/remark-lint-emphasis-marker/package.json b/packages/remark-lint-emphasis-marker/package.json
index 98d3da1a..45f57acd 100644
--- a/packages/remark-lint-emphasis-marker/package.json
+++ b/packages/remark-lint-emphasis-marker/package.json
@@ -24,14 +24,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-emphasis-marker/readme.md b/packages/remark-lint-emphasis-marker/readme.md
index 61200639..f3892b10 100644
--- a/packages/remark-lint-emphasis-marker/readme.md
+++ b/packages/remark-lint-emphasis-marker/readme.md
@@ -126,12 +126,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-emphasis-marker
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintEmphasisMarker`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -212,6 +218,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-emphasis-marker/tsconfig.json b/packages/remark-lint-emphasis-marker/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-emphasis-marker/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-fenced-code-flag/index.js b/packages/remark-lint-fenced-code-flag/index.js
index a6953bf6..204be7c2 100644
--- a/packages/remark-lint-fenced-code-flag/index.js
+++ b/packages/remark-lint-fenced-code-flag/index.js
@@ -61,6 +61,13 @@
  *   ```
  *
  * @example
+ *   {"name": "ok.md", "setting": {"flags":["alpha"]}}
+ *
+ *   ```alpha
+ *   bravo()
+ *   ```
+ *
+ * @example
  *   {"name": "not-ok.md", "setting": ["charlie"], "label": "input"}
  *
  *   ```alpha
@@ -73,6 +80,18 @@
  *   1:1-3:4: Incorrect code language flag
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ *
+ * @typedef {string[]} Flags
+ *
+ * @typedef FlagMap
+ * @property {Flags} [flags]
+ * @property {boolean} [allowEmpty=false]
+ *
+ * @typedef {Flags|FlagMap} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
@@ -82,19 +101,23 @@ const fence = /^ {0,3}([~`])\1{2,}/
 
 const remarkLintFencedCodeFlag = lintRule(
   'remark-lint:fenced-code-flag',
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
   (tree, file, option) => {
     const value = String(file)
     let allowEmpty = false
+    /** @type {string[]} */
     let allowed = []
-    let flags = option
 
-    if (typeof flags === 'object' && !Array.isArray(flags)) {
-      allowEmpty = Boolean(flags.allowEmpty)
-      flags = flags.flags
-    }
+    if (typeof option === 'object') {
+      if (Array.isArray(option)) {
+        allowed = option
+      } else {
+        allowEmpty = Boolean(option.allowEmpty)
 
-    if (Array.isArray(flags)) {
-      allowed = String(flags).split(',')
+        if (option.flags) {
+          allowed = option.flags
+        }
+      }
     }
 
     visit(tree, 'code', (node) => {
diff --git a/packages/remark-lint-fenced-code-flag/package.json b/packages/remark-lint-fenced-code-flag/package.json
index 19daa884..d079e02a 100644
--- a/packages/remark-lint-fenced-code-flag/package.json
+++ b/packages/remark-lint-fenced-code-flag/package.json
@@ -26,14 +26,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-fenced-code-flag/readme.md b/packages/remark-lint-fenced-code-flag/readme.md
index 7a1b8469..5fb5d3c1 100644
--- a/packages/remark-lint-fenced-code-flag/readme.md
+++ b/packages/remark-lint-fenced-code-flag/readme.md
@@ -111,6 +111,22 @@ bravo()
 
 No messages.
 
+##### `ok.md`
+
+When configured with `{ flags: [ 'alpha' ] }`.
+
+###### In
+
+````markdown
+```alpha
+bravo()
+```
+````
+
+###### Out
+
+No messages.
+
 ##### `not-ok.md`
 
 When configured with `[ 'charlie' ]`.
@@ -131,12 +147,18 @@ bravo()
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-fenced-code-flag
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintFencedCodeFlag`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -217,6 +239,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-fenced-code-flag/tsconfig.json b/packages/remark-lint-fenced-code-flag/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-fenced-code-flag/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-fenced-code-marker/index.js b/packages/remark-lint-fenced-code-marker/index.js
index 8c43c8e3..0b6ad6ea 100644
--- a/packages/remark-lint-fenced-code-marker/index.js
+++ b/packages/remark-lint-fenced-code-marker/index.js
@@ -89,53 +89,50 @@
  *   1:1: Incorrect fenced code marker `💩`: use either `'consistent'`, `` '`' ``, or `'~'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'~'|'`'} Marker
+ * @typedef {'consistent'|Marker} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
-
-const markers = {
-  '`': true,
-  '~': true,
-  null: true
-}
 
 const remarkLintFencedCodeMarker = lintRule(
   'remark-lint:fenced-code-marker',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
     const contents = String(file)
-    let preferred =
-      typeof option === 'string' && option !== 'consistent' ? option : null
 
-    if (markers[preferred] !== true) {
+    if (option !== 'consistent' && option !== '~' && option !== '`') {
       file.fail(
         'Incorrect fenced code marker `' +
-          preferred +
+          option +
           "`: use either `'consistent'`, `` '`' ``, or `'~'`"
       )
     }
 
     visit(tree, 'code', (node) => {
-      if (!generated(node)) {
-        const start = pointStart(node).offset
+      const start = pointStart(node).offset
+
+      if (typeof start === 'number') {
         const marker = contents
           .slice(start, start + 4)
           .replace(/^\s+/, '')
           .charAt(0)
 
         // Ignore unfenced code blocks.
-        if (markers[marker] === true) {
-          if (preferred) {
-            if (marker !== preferred) {
-              file.message(
-                'Fenced code should use `' +
-                  (preferred === '~' ? preferred : '` ` `') +
-                  '` as a marker',
-                node
-              )
-            }
-          } else {
-            preferred = marker
+        if (marker === '~' || marker === '`') {
+          if (option === 'consistent') {
+            option = marker
+          } else if (marker !== option) {
+            file.message(
+              'Fenced code should use `' +
+                (option === '~' ? option : '` ` `') +
+                '` as a marker',
+              node
+            )
           }
         }
       }
diff --git a/packages/remark-lint-fenced-code-marker/package.json b/packages/remark-lint-fenced-code-marker/package.json
index c938c385..8a9f82f4 100644
--- a/packages/remark-lint-fenced-code-marker/package.json
+++ b/packages/remark-lint-fenced-code-marker/package.json
@@ -25,14 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-fenced-code-marker/readme.md b/packages/remark-lint-fenced-code-marker/readme.md
index 2f70a3e3..85556fa8 100644
--- a/packages/remark-lint-fenced-code-marker/readme.md
+++ b/packages/remark-lint-fenced-code-marker/readme.md
@@ -145,12 +145,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-fenced-code-marker
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintFencedCodeMarker`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -231,6 +237,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-fenced-code-marker/tsconfig.json b/packages/remark-lint-fenced-code-marker/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-fenced-code-marker/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-file-extension/index.js b/packages/remark-lint-file-extension/index.js
index e5ed5de9..fdeec71c 100644
--- a/packages/remark-lint-file-extension/index.js
+++ b/packages/remark-lint-file-extension/index.js
@@ -26,11 +26,17 @@
  *   {"name": "readme.mkd", "setting": "mkd"}
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {string} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 
 const remarkLintFileExtension = lintRule(
   'remark-lint:file-extension',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (_, file, option) => {
     const ext = file.extname
     const preferred = typeof option === 'string' ? option : 'md'
 
diff --git a/packages/remark-lint-file-extension/package.json b/packages/remark-lint-file-extension/package.json
index 12886e94..0d3286d4 100644
--- a/packages/remark-lint-file-extension/package.json
+++ b/packages/remark-lint-file-extension/package.json
@@ -25,11 +25,24 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-file-extension/readme.md b/packages/remark-lint-file-extension/readme.md
index 8ea1979d..9aca8f0f 100644
--- a/packages/remark-lint-file-extension/readme.md
+++ b/packages/remark-lint-file-extension/readme.md
@@ -57,12 +57,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-file-extension
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintFileExtension`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -143,6 +149,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-file-extension/tsconfig.json b/packages/remark-lint-file-extension/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-file-extension/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-final-definition/index.js b/packages/remark-lint-final-definition/index.js
index 86417648..833292c3 100644
--- a/packages/remark-lint-final-definition/index.js
+++ b/packages/remark-lint-final-definition/index.js
@@ -40,6 +40,10 @@
  *   [example-2]: http://example.com/two/
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
@@ -47,8 +51,9 @@ import {generated} from 'unist-util-generated'
 
 const remarkLintFinalDefinition = lintRule(
   'remark-lint:final-definition',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
-    let last = null
+    let last = 0
 
     visit(
       tree,
@@ -65,7 +70,7 @@ const remarkLintFinalDefinition = lintRule(
         const line = pointStart(node).line
 
         if (node.type === 'definition') {
-          if (last !== null && last > line) {
+          if (last && last > line) {
             file.message(
               'Move definitions to the end of the file (after the node at line `' +
                 last +
@@ -73,7 +78,7 @@ const remarkLintFinalDefinition = lintRule(
               node
             )
           }
-        } else if (last === null) {
+        } else if (last === 0) {
           last = line
         }
       },
diff --git a/packages/remark-lint-final-definition/package.json b/packages/remark-lint-final-definition/package.json
index 665bf74b..17c23efa 100644
--- a/packages/remark-lint-final-definition/package.json
+++ b/packages/remark-lint-final-definition/package.json
@@ -25,14 +25,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-final-definition/readme.md b/packages/remark-lint-final-definition/readme.md
index ac637efa..dde8a829 100644
--- a/packages/remark-lint-final-definition/readme.md
+++ b/packages/remark-lint-final-definition/readme.md
@@ -75,12 +75,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-final-definition
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintFinalDefinition`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -161,6 +167,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-final-definition/tsconfig.json b/packages/remark-lint-final-definition/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-final-definition/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-final-newline/index.js b/packages/remark-lint-final-newline/index.js
index 3bd6d857..b6039903 100644
--- a/packages/remark-lint-final-newline/index.js
+++ b/packages/remark-lint-final-newline/index.js
@@ -50,11 +50,16 @@
  *   ```
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 
 const remarkLintFinalNewline = lintRule(
   'remark-lint:final-newline',
-  (tree, file) => {
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
+  (_, file) => {
     const value = String(file)
     const last = value.length - 1
 
diff --git a/packages/remark-lint-final-newline/package.json b/packages/remark-lint-final-newline/package.json
index cbcc6fb1..5d09bb87 100644
--- a/packages/remark-lint-final-newline/package.json
+++ b/packages/remark-lint-final-newline/package.json
@@ -25,11 +25,24 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-final-newline/readme.md b/packages/remark-lint-final-newline/readme.md
index 198cf452..5c89acf0 100644
--- a/packages/remark-lint-final-newline/readme.md
+++ b/packages/remark-lint-final-newline/readme.md
@@ -65,12 +65,18 @@ This rule is included in the following presets:
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-final-newline
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintFinalNewline`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -151,6 +157,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-final-newline/tsconfig.json b/packages/remark-lint-final-newline/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-final-newline/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-first-heading-level/index.js b/packages/remark-lint-first-heading-level/index.js
index 9c0d4848..0d93a1bd 100644
--- a/packages/remark-lint-first-heading-level/index.js
+++ b/packages/remark-lint-first-heading-level/index.js
@@ -90,6 +90,13 @@
  *   1:1-1:14: First heading level should be `2`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').HTML} HTML
+ * @typedef {import('mdast').Heading['depth']} Depth
+ * @typedef {Depth} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit, EXIT} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
@@ -98,11 +105,11 @@ const re = /<h([1-6])/
 
 const remarkLintFirstHeadingLevel = lintRule(
   'remark-lint:first-heading-level',
-  (tree, file, option) => {
-    const preferred = option && option !== true ? option : 1
-
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 1) => {
     visit(tree, (node) => {
       if (!generated(node)) {
+        /** @type {Depth|undefined} */
         let rank
 
         if (node.type === 'heading') {
@@ -112,11 +119,8 @@ const remarkLintFirstHeadingLevel = lintRule(
         }
 
         if (rank !== undefined) {
-          if (rank !== preferred) {
-            file.message(
-              'First heading level should be `' + preferred + '`',
-              node
-            )
+          if (rank !== option) {
+            file.message('First heading level should be `' + option + '`', node)
           }
 
           return EXIT
@@ -128,7 +132,12 @@ const remarkLintFirstHeadingLevel = lintRule(
 
 export default remarkLintFirstHeadingLevel
 
+/**
+ * @param {HTML} node
+ * @returns {Depth|undefined}
+ */
 function infer(node) {
   const results = node.value.match(re)
+  // @ts-expect-error: can be castes fine.
   return results ? Number(results[1]) : undefined
 }
diff --git a/packages/remark-lint-first-heading-level/package.json b/packages/remark-lint-first-heading-level/package.json
index a8777a6d..c7578e30 100644
--- a/packages/remark-lint-first-heading-level/package.json
+++ b/packages/remark-lint-first-heading-level/package.json
@@ -26,13 +26,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-first-heading-level/readme.md b/packages/remark-lint-first-heading-level/readme.md
index 95d0653a..f7a237c3 100644
--- a/packages/remark-lint-first-heading-level/readme.md
+++ b/packages/remark-lint-first-heading-level/readme.md
@@ -162,12 +162,18 @@ Paragraph.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-first-heading-level
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintFirstHeadingLevel`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -248,6 +254,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-first-heading-level/tsconfig.json b/packages/remark-lint-first-heading-level/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-first-heading-level/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-hard-break-spaces/index.js b/packages/remark-lint-hard-break-spaces/index.js
index ffb68b54..3b8cf438 100644
--- a/packages/remark-lint-hard-break-spaces/index.js
+++ b/packages/remark-lint-hard-break-spaces/index.js
@@ -24,6 +24,10 @@
  *   1:12-2:1: Use two spaces for hard line breaks
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
@@ -31,6 +35,7 @@ import {generated} from 'unist-util-generated'
 
 const remarkLintHardBreakSpaces = lintRule(
   'remark-lint:hard-break-spaces',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
 
diff --git a/packages/remark-lint-hard-break-spaces/package.json b/packages/remark-lint-hard-break-spaces/package.json
index d2d224d7..81f33a56 100644
--- a/packages/remark-lint-hard-break-spaces/package.json
+++ b/packages/remark-lint-hard-break-spaces/package.json
@@ -26,14 +26,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-hard-break-spaces/readme.md b/packages/remark-lint-hard-break-spaces/readme.md
index 49de9e79..c207b259 100644
--- a/packages/remark-lint-hard-break-spaces/readme.md
+++ b/packages/remark-lint-hard-break-spaces/readme.md
@@ -57,12 +57,18 @@ dolor sit amet.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-hard-break-spaces
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintHardBreakSpaces`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -143,6 +149,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-hard-break-spaces/tsconfig.json b/packages/remark-lint-hard-break-spaces/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-hard-break-spaces/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-heading-increment/index.js b/packages/remark-lint-heading-increment/index.js
index 5c89b366..963a36df 100644
--- a/packages/remark-lint-heading-increment/index.js
+++ b/packages/remark-lint-heading-increment/index.js
@@ -26,13 +26,20 @@
  *   3:1-3:10: Heading levels should increment by one level at a time
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').Heading['depth']} Depth
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
 
 const remarkLintHeadingIncrement = lintRule(
   'remark-lint:heading-increment',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
+    /** @type {Depth} */
     let previous
 
     visit(tree, 'heading', (node) => {
diff --git a/packages/remark-lint-heading-increment/package.json b/packages/remark-lint-heading-increment/package.json
index e42c774f..22ae6041 100644
--- a/packages/remark-lint-heading-increment/package.json
+++ b/packages/remark-lint-heading-increment/package.json
@@ -25,13 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-heading-increment/readme.md b/packages/remark-lint-heading-increment/readme.md
index 99352ce1..9a3593a7 100644
--- a/packages/remark-lint-heading-increment/readme.md
+++ b/packages/remark-lint-heading-increment/readme.md
@@ -54,12 +54,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-heading-increment
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintHeadingIncrement`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -140,6 +146,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-heading-increment/tsconfig.json b/packages/remark-lint-heading-increment/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-heading-increment/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-heading-style/index.js b/packages/remark-lint-heading-style/index.js
index 9496b662..246c9a16 100644
--- a/packages/remark-lint-heading-style/index.js
+++ b/packages/remark-lint-heading-style/index.js
@@ -69,6 +69,17 @@
  *
  *   4:1-4:8: Headings should use setext
  *   6:1-6:13: Headings should use setext
+ *
+ * @example
+ *   {"name": "not-ok.md", "setting": "💩", "label": "output", "positionless": true}
+ *
+ *   1:1: Incorrect heading style type `💩`: use either `'consistent'`, `'atx'`, `'atx-closed'`, or `'setext'`
+ */
+
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'atx'|'atx-closed'|'setext'} Type
+ * @typedef {'consistent'|Type} Options
  */
 
 import {lintRule} from 'unified-lint-rule'
@@ -76,21 +87,31 @@ import {visit} from 'unist-util-visit'
 import {headingStyle} from 'mdast-util-heading-style'
 import {generated} from 'unist-util-generated'
 
-const types = new Set(['atx', 'atx-closed', 'setext'])
-
 const remarkLintHeadingStyle = lintRule(
   'remark-lint:heading-style',
-  (tree, file, option) => {
-    let preferred = types.has(option) ? option : null
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
+    if (
+      option !== 'consistent' &&
+      option !== 'atx' &&
+      option !== 'atx-closed' &&
+      option !== 'setext'
+    ) {
+      file.fail(
+        'Incorrect heading style type `' +
+          option +
+          "`: use either `'consistent'`, `'atx'`, `'atx-closed'`, or `'setext'`"
+      )
+    }
 
     visit(tree, 'heading', (node) => {
       if (!generated(node)) {
-        if (preferred) {
-          if (headingStyle(node, preferred) !== preferred) {
-            file.message('Headings should use ' + preferred, node)
-          }
-        } else {
-          preferred = headingStyle(node, preferred)
+        if (option === 'consistent') {
+          // Funky nodes perhaps cannot be detected.
+          /* c8 ignore next */
+          option = headingStyle(node) || 'consistent'
+        } else if (headingStyle(node, option) !== option) {
+          file.message('Headings should use ' + option, node)
         }
       }
     })
diff --git a/packages/remark-lint-heading-style/package.json b/packages/remark-lint-heading-style/package.json
index ffc09200..5d222510 100644
--- a/packages/remark-lint-heading-style/package.json
+++ b/packages/remark-lint-heading-style/package.json
@@ -26,14 +26,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "mdast-util-heading-style": "^2.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-heading-style/readme.md b/packages/remark-lint-heading-style/readme.md
index 538a8f56..680df304 100644
--- a/packages/remark-lint-heading-style/readme.md
+++ b/packages/remark-lint-heading-style/readme.md
@@ -118,14 +118,30 @@ Juliett
 6:1-6:13: Headings should use setext
 ```
 
+##### `not-ok.md`
+
+When configured with `'💩'`.
+
+###### Out
+
+```text
+1:1: Incorrect heading style type `💩`: use either `'consistent'`, `'atx'`, `'atx-closed'`, or `'setext'`
+```
+
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-heading-style
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintHeadingStyle`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -206,6 +222,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-heading-style/tsconfig.json b/packages/remark-lint-heading-style/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-heading-style/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-linebreak-style/index.js b/packages/remark-lint-linebreak-style/index.js
index 8a5e4ad7..1c678a27 100644
--- a/packages/remark-lint-linebreak-style/index.js
+++ b/packages/remark-lint-linebreak-style/index.js
@@ -51,41 +51,43 @@
  *   1:6: Expected linebreaks to be windows (`\r\n`), not unix (`\n`)
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'unix'|'windows'} Type
+ * @typedef {'consistent'|Type} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {location} from 'vfile-location'
 
 const escaped = {unix: '\\n', windows: '\\r\\n'}
-const types = {true: 'windows', false: 'unix'}
 
 const remarkLintLinebreakStyle = lintRule(
   'remark-lint:linebreak-style',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (_, file, option = 'consistent') => {
     const value = String(file)
     const toPoint = location(value).toPoint
-    let preferred =
-      typeof option === 'string' && option !== 'consistent' ? option : null
     let index = value.indexOf('\n')
 
     while (index !== -1) {
-      const type = types[value.charAt(index - 1) === '\r']
+      const type = value.charAt(index - 1) === '\r' ? 'windows' : 'unix'
 
-      if (preferred) {
-        if (preferred !== type) {
-          file.message(
-            'Expected linebreaks to be ' +
-              preferred +
-              ' (`' +
-              escaped[preferred] +
-              '`), not ' +
-              type +
-              ' (`' +
-              escaped[type] +
-              '`)',
-            toPoint(index)
-          )
-        }
-      } else {
-        preferred = type
+      if (option === 'consistent') {
+        option = type
+      } else if (option !== type) {
+        file.message(
+          'Expected linebreaks to be ' +
+            option +
+            ' (`' +
+            escaped[option] +
+            '`), not ' +
+            type +
+            ' (`' +
+            escaped[type] +
+            '`)',
+          toPoint(index)
+        )
       }
 
       index = value.indexOf('\n', index + 1)
diff --git a/packages/remark-lint-linebreak-style/package.json b/packages/remark-lint-linebreak-style/package.json
index f776b353..6b5c7d9f 100644
--- a/packages/remark-lint-linebreak-style/package.json
+++ b/packages/remark-lint-linebreak-style/package.json
@@ -29,12 +29,25 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "vfile-location": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-linebreak-style/readme.md b/packages/remark-lint-linebreak-style/readme.md
index 7d88ce80..17a2351a 100644
--- a/packages/remark-lint-linebreak-style/readme.md
+++ b/packages/remark-lint-linebreak-style/readme.md
@@ -98,12 +98,18 @@ Alpha␊
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-linebreak-style
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintLinebreakStyle`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -184,6 +190,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-linebreak-style/tsconfig.json b/packages/remark-lint-linebreak-style/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-linebreak-style/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-link-title-style/index.js b/packages/remark-lint-link-title-style/index.js
index 78168277..d421de8c 100644
--- a/packages/remark-lint-link-title-style/index.js
+++ b/packages/remark-lint-link-title-style/index.js
@@ -98,11 +98,16 @@
  *   1:1: Incorrect link title style marker `💩`: use either `'consistent'`, `'"'`, `'\''`, or `'()'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'"'|"'"|'()'} Marker
+ * @typedef {'consistent'|Marker} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {location} from 'vfile-location'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
 
 const own = {}.hasOwnProperty
 
@@ -114,42 +119,48 @@ const markers = {
 
 const remarkLintLinkTitleStyle = lintRule(
   'remark-lint:link-title-style',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
     const value = String(file)
     const loc = location(file)
-    let preferred =
-      typeof option === 'string' && option !== 'consistent' ? option : null
-
-    if (preferred === '()' || preferred === '(') {
-      preferred = ')'
-    }
+    // @ts-expect-error: allow other paren combos.
+    let look = option === '()' || option === '(' ? ')' : option
 
-    if (preferred && !own.call(markers, preferred)) {
+    if (look !== 'consistent' && !own.call(markers, look)) {
       file.fail(
         'Incorrect link title style marker `' +
-          preferred +
+          look +
           "`: use either `'consistent'`, `'\"'`, `'\\''`, or `'()'`"
       )
     }
 
     visit(tree, (node) => {
       if (
-        (node.type === 'link' ||
-          node.type === 'image' ||
-          node.type === 'definition') &&
-        !generated(node)
+        node.type === 'link' ||
+        node.type === 'image' ||
+        node.type === 'definition'
       ) {
-        const tail = node.children
-          ? node.children[node.children.length - 1]
-          : null
+        const tail =
+          'children' in node
+            ? node.children[node.children.length - 1]
+            : undefined
         const begin = tail ? pointEnd(tail) : pointStart(node)
-        let last = pointEnd(node).offset - 1
+        const end = pointEnd(node)
+
+        if (
+          typeof begin.offset !== 'number' ||
+          typeof end.offset !== 'number'
+        ) {
+          return
+        }
+
+        let last = end.offset - 1
 
         if (node.type !== 'definition') {
           last--
         }
 
-        const final = value.charAt(last)
+        const final = /** @type {keyof markers} */ (value.charAt(last))
 
         // Exit if the final marker is not a known marker.
         if (!(final in markers)) {
@@ -163,24 +174,22 @@ const remarkLintLinkTitleStyle = lintRule(
 
         // Exit if there’s no starting delimiter, the starting delimiter is before
         // the start of the node, or if it’s not preceded by whitespace.
-        if (first <= begin || !/\s/.test(value.charAt(first - 1))) {
+        if (first <= begin.offset || !/\s/.test(value.charAt(first - 1))) {
           return
         }
 
-        if (preferred) {
-          if (preferred !== final) {
-            file.message(
-              'Titles should use `' +
-                (preferred === ')' ? '()' : preferred) +
-                '` as a quote',
-              {
-                start: loc.toPoint(first),
-                end: loc.toPoint(last + 1)
-              }
-            )
-          }
-        } else {
-          preferred = final
+        if (look === 'consistent') {
+          look = final
+        } else if (look !== final) {
+          file.message(
+            'Titles should use `' +
+              (look === ')' ? '()' : look) +
+              '` as a quote',
+            {
+              start: loc.toPoint(first),
+              end: loc.toPoint(last + 1)
+            }
+          )
         }
       }
     })
diff --git a/packages/remark-lint-link-title-style/package.json b/packages/remark-lint-link-title-style/package.json
index 1f2f76d8..38e8e5f3 100644
--- a/packages/remark-lint-link-title-style/package.json
+++ b/packages/remark-lint-link-title-style/package.json
@@ -26,15 +26,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0",
     "vfile-location": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-link-title-style/readme.md b/packages/remark-lint-link-title-style/readme.md
index a0652f68..c6d11e0d 100644
--- a/packages/remark-lint-link-title-style/readme.md
+++ b/packages/remark-lint-link-title-style/readme.md
@@ -170,12 +170,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-link-title-style
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintLinkTitleStyle`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -256,6 +262,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-link-title-style/tsconfig.json b/packages/remark-lint-link-title-style/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-link-title-style/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-list-item-bullet-indent/index.js b/packages/remark-lint-list-item-bullet-indent/index.js
index e4d5e199..7f4188db 100644
--- a/packages/remark-lint-list-item-bullet-indent/index.js
+++ b/packages/remark-lint-list-item-bullet-indent/index.js
@@ -37,13 +37,17 @@
  *   4:2: Incorrect indentation before bullet: remove 1 space
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import plural from 'pluralize'
 import {visit} from 'unist-util-visit'
-import {generated} from 'unist-util-generated'
 
 const remarkLintListItemBulletIndent = lintRule(
   'remark-lint:list-item-bullet-indent',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'list', (list, _, grandparent) => {
       let index = -1
@@ -54,8 +58,10 @@ const remarkLintListItemBulletIndent = lintRule(
         if (
           grandparent &&
           grandparent.type === 'root' &&
-          !generated(item) &&
-          !generated(grandparent)
+          grandparent.position &&
+          typeof grandparent.position.start.column === 'number' &&
+          item.position &&
+          typeof item.position.start.column === 'number'
         ) {
           const indent =
             item.position.start.column - grandparent.position.start.column
diff --git a/packages/remark-lint-list-item-bullet-indent/package.json b/packages/remark-lint-list-item-bullet-indent/package.json
index 36566714..86ed6e65 100644
--- a/packages/remark-lint-list-item-bullet-indent/package.json
+++ b/packages/remark-lint-list-item-bullet-indent/package.json
@@ -25,14 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "pluralize": "^8.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-list-item-bullet-indent/readme.md b/packages/remark-lint-list-item-bullet-indent/readme.md
index cb1d893f..615757a9 100644
--- a/packages/remark-lint-list-item-bullet-indent/readme.md
+++ b/packages/remark-lint-list-item-bullet-indent/readme.md
@@ -67,12 +67,18 @@ Paragraph.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-list-item-bullet-indent
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintListItemBulletIndent`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -153,6 +159,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-list-item-bullet-indent/tsconfig.json b/packages/remark-lint-list-item-bullet-indent/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-list-item-bullet-indent/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-list-item-content-indent/index.js b/packages/remark-lint-list-item-content-indent/index.js
index 850cdc0e..d35ffc71 100644
--- a/packages/remark-lint-list-item-content-indent/index.js
+++ b/packages/remark-lint-list-item-content-indent/index.js
@@ -24,31 +24,38 @@
  *   2:5: Don’t use mixed indentation for children, remove 1 space
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import plural from 'pluralize'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
 
 const remarkLintListItemContentIndent = lintRule(
   'remark-lint:list-item-content-indent',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
 
     visit(tree, 'listItem', (node) => {
       let index = -1
+      /** @type {number|undefined} */
       let style
 
       while (++index < node.children.length) {
         const item = node.children[index]
+        const begin = pointStart(item)
+        let column = begin.column
 
-        if (generated(item)) {
+        if (
+          typeof begin.column !== 'number' ||
+          typeof begin.offset !== 'number'
+        ) {
           continue
         }
 
-        const begin = pointStart(item)
-        let column = begin.column
-
         // Get indentation for the first child.  Only the first item can have a
         // checkbox, so here we remove that from the column.
         if (index === 0) {
@@ -70,7 +77,7 @@ const remarkLintListItemContentIndent = lintRule(
         }
 
         // Warn for violating children.
-        if (column !== style) {
+        if (style && column !== style) {
           const diff = style - column
           const abs = Math.abs(diff)
 
diff --git a/packages/remark-lint-list-item-content-indent/package.json b/packages/remark-lint-list-item-content-indent/package.json
index e1d24b7f..a4219d1f 100644
--- a/packages/remark-lint-list-item-content-indent/package.json
+++ b/packages/remark-lint-list-item-content-indent/package.json
@@ -26,15 +26,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "pluralize": "^8.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-list-item-content-indent/readme.md b/packages/remark-lint-list-item-content-indent/readme.md
index 7c8899bc..27a75520 100644
--- a/packages/remark-lint-list-item-content-indent/readme.md
+++ b/packages/remark-lint-list-item-content-indent/readme.md
@@ -61,12 +61,18 @@ Note: `·` represents a space.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-list-item-content-indent
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintListItemContentIndent`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -147,6 +153,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-list-item-content-indent/tsconfig.json b/packages/remark-lint-list-item-content-indent/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-list-item-content-indent/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-list-item-indent/index.js b/packages/remark-lint-list-item-indent/index.js
index a17ac4d5..1e1a7ce8 100644
--- a/packages/remark-lint-list-item-indent/index.js
+++ b/packages/remark-lint-list-item-indent/index.js
@@ -113,24 +113,27 @@
  *    1:1: Incorrect list-item indent style `💩`: use either `'tab-size'`, `'space'`, or `'mixed'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'tab-size'|'space'|'mixed'} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import plural from 'pluralize'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
 import {generated} from 'unist-util-generated'
 
-const styles = {'tab-size': true, mixed: true, space: true}
-
 const remarkLintListItemIndent = lintRule(
   'remark-lint:list-item-indent',
-  (tree, file, option) => {
-    const preferred = typeof option === 'string' ? option : 'tab-size'
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'tab-size') => {
     const value = String(file)
 
-    if (styles[preferred] !== true) {
+    if (option !== 'tab-size' && option !== 'space' && option !== 'mixed') {
       file.fail(
         'Incorrect list-item indent style `' +
-          preferred +
+          option +
           "`: use either `'tab-size'`, `'space'`, or `'mixed'`"
       )
     }
@@ -138,7 +141,8 @@ const remarkLintListItemIndent = lintRule(
     visit(tree, 'list', (node) => {
       if (generated(node)) return
 
-      const spread = node.spread || node.loose
+      // @ts-expect-error: legacy.
+      const spread = Boolean(node.spread || node.loose)
       let index = -1
 
       while (++index < node.children.length) {
@@ -153,7 +157,7 @@ const remarkLintListItemIndent = lintRule(
         const bulletSize = marker.replace(/\s+$/, '').length
 
         const style =
-          preferred === 'tab-size' || (preferred === 'mixed' && spread)
+          option === 'tab-size' || (option === 'mixed' && spread)
             ? Math.ceil(bulletSize / 4) * 4
             : bulletSize + 1
 
diff --git a/packages/remark-lint-list-item-indent/package.json b/packages/remark-lint-list-item-indent/package.json
index a79826df..2805e55e 100644
--- a/packages/remark-lint-list-item-indent/package.json
+++ b/packages/remark-lint-list-item-indent/package.json
@@ -25,15 +25,28 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "pluralize": "^8.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-list-item-indent/readme.md b/packages/remark-lint-list-item-indent/readme.md
index 5a5b059c..e3e8971c 100644
--- a/packages/remark-lint-list-item-indent/readme.md
+++ b/packages/remark-lint-list-item-indent/readme.md
@@ -191,12 +191,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-list-item-indent
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintListItemIndent`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -277,6 +283,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-list-item-indent/tsconfig.json b/packages/remark-lint-list-item-indent/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-list-item-indent/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-list-item-spacing/index.js b/packages/remark-lint-list-item-spacing/index.js
index 9b3fcd20..3bac1c3a 100644
--- a/packages/remark-lint-list-item-spacing/index.js
+++ b/packages/remark-lint-list-item-spacing/index.js
@@ -113,6 +113,14 @@
  *   14:15-16:1: Extraneous new line after list item
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').ListItem} ListItem
+ *
+ * @typedef Options
+ * @property {boolean} [checkBlanks=false]
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
@@ -120,6 +128,7 @@ import {generated} from 'unist-util-generated'
 
 const remarkLintListItemSpacing = lintRule(
   'remark-lint:list-item-spacing',
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
   (tree, file, option = {}) => {
     const {checkBlanks} = option
     const infer = checkBlanks ? inferBlankLine : inferMultiline
@@ -158,6 +167,10 @@ const remarkLintListItemSpacing = lintRule(
 
 export default remarkLintListItemSpacing
 
+/**
+ * @param {ListItem} node
+ * @returns {boolean}
+ */
 function inferBlankLine(node) {
   let index = 0
 
@@ -174,6 +187,10 @@ function inferBlankLine(node) {
   return false
 }
 
+/**
+ * @param {ListItem} node
+ * @returns {boolean}
+ */
 function inferMultiline(node) {
   return (
     pointEnd(node.children[node.children.length - 1]).line -
diff --git a/packages/remark-lint-list-item-spacing/package.json b/packages/remark-lint-list-item-spacing/package.json
index 71cfbd7b..b850c1d8 100644
--- a/packages/remark-lint-list-item-spacing/package.json
+++ b/packages/remark-lint-list-item-spacing/package.json
@@ -26,14 +26,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-list-item-spacing/readme.md b/packages/remark-lint-list-item-spacing/readme.md
index 09066421..262f0b7a 100644
--- a/packages/remark-lint-list-item-spacing/readme.md
+++ b/packages/remark-lint-list-item-spacing/readme.md
@@ -156,12 +156,18 @@ A loose list:
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-list-item-spacing
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintListItemSpacing`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -242,6 +248,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-list-item-spacing/tsconfig.json b/packages/remark-lint-list-item-spacing/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-list-item-spacing/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-maximum-heading-length/index.js b/packages/remark-lint-maximum-heading-length/index.js
index e2fc3856..87018273 100644
--- a/packages/remark-lint-maximum-heading-length/index.js
+++ b/packages/remark-lint-maximum-heading-length/index.js
@@ -28,6 +28,11 @@
  *   1:1-1:52: Use headings shorter than `40`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {number} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
@@ -35,12 +40,11 @@ import {toString} from 'mdast-util-to-string'
 
 const remarkLintMaximumHeadingLength = lintRule(
   'remark-lint:maximum-heading-length',
-  (tree, file, option) => {
-    const preferred = typeof option === 'number' ? option : 60
-
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 60) => {
     visit(tree, 'heading', (node) => {
-      if (!generated(node) && toString(node).length > preferred) {
-        file.message('Use headings shorter than `' + preferred + '`', node)
+      if (!generated(node) && toString(node).length > option) {
+        file.message('Use headings shorter than `' + option + '`', node)
       }
     })
   }
diff --git a/packages/remark-lint-maximum-heading-length/package.json b/packages/remark-lint-maximum-heading-length/package.json
index 4bd151e5..c66d4756 100644
--- a/packages/remark-lint-maximum-heading-length/package.json
+++ b/packages/remark-lint-maximum-heading-length/package.json
@@ -24,14 +24,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "mdast-util-to-string": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-maximum-heading-length/readme.md b/packages/remark-lint-maximum-heading-length/readme.md
index d13f01ae..109f9b8a 100644
--- a/packages/remark-lint-maximum-heading-length/readme.md
+++ b/packages/remark-lint-maximum-heading-length/readme.md
@@ -58,12 +58,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-maximum-heading-length
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintMaximumHeadingLength`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -144,6 +150,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-maximum-heading-length/tsconfig.json b/packages/remark-lint-maximum-heading-length/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-maximum-heading-length/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-maximum-line-length/index.js b/packages/remark-lint-maximum-line-length/index.js
index 7c3cb233..57621b43 100644
--- a/packages/remark-lint-maximum-line-length/index.js
+++ b/packages/remark-lint-maximum-line-length/index.js
@@ -96,6 +96,12 @@
  *   4:12: Line must be at most 10 characters
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').Parent} Parent
+ * @typedef {number} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
@@ -103,85 +109,93 @@ import {generated} from 'unist-util-generated'
 
 const remarkLintMaximumLineLength = lintRule(
   'remark-lint:maximum-line-length',
-  maximumLineLength
-)
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 80) => {
+    const value = String(file)
+    const lines = value.split(/\r?\n/)
 
-export default remarkLintMaximumLineLength
+    visit(tree, (node) => {
+      if (
+        (node.type === 'heading' ||
+          node.type === 'table' ||
+          node.type === 'code' ||
+          node.type === 'definition' ||
+          node.type === 'html' ||
+          // @ts-expect-error: JSX is from MDX: <https://github.com/mdx-js/specification>.
+          node.type === 'jsx' ||
+          node.type === 'yaml' ||
+          // @ts-expect-error: TOML is from frontmatter.
+          node.type === 'toml') &&
+        !generated(node)
+      ) {
+        allowList(pointStart(node).line - 1, pointEnd(node).line)
+      }
+    })
 
-function maximumLineLength(tree, file, option) {
-  const preferred = typeof option === 'number' ? option : 80
-  const value = String(file)
-  const lines = value.split(/\r?\n/)
+    // Finally, allow some inline spans, but only if they occur at or after
+    // the wrap.
+    // However, when they do, and there’s whitespace after it, they are not
+    // allowed.
+    visit(tree, (node, pos, parent_) => {
+      const parent = /** @type {Parent} */ (parent_)
 
-  visit(tree, (node) => {
-    // Note: JSX is from MDX: <https://github.com/mdx-js/specification>.
-    if (
-      (node.type === 'heading' ||
-        node.type === 'table' ||
-        node.type === 'code' ||
-        node.type === 'definition' ||
-        node.type === 'html' ||
-        node.type === 'jsx' ||
-        node.type === 'yaml' ||
-        node.type === 'toml') &&
-      !generated(node)
-    ) {
-      allowList(pointStart(node).line - 1, pointEnd(node).line)
-    }
-  })
+      if (
+        (node.type === 'link' ||
+          node.type === 'image' ||
+          node.type === 'inlineCode') &&
+        !generated(node) &&
+        parent &&
+        typeof pos === 'number'
+      ) {
+        const initial = pointStart(node)
+        const final = pointEnd(node)
 
-  // Finally, allow some inline spans, but only if they occur at or after
-  // the wrap.
-  // However, when they do, and there’s whitespace after it, they are not
-  // allowed.
-  visit(tree, (node, pos, parent) => {
-    if (
-      (node.type === 'link' ||
-        node.type === 'image' ||
-        node.type === 'inlineCode') &&
-      !generated(node)
-    ) {
-      const initial = pointStart(node)
-      const final = pointEnd(node)
+        // Not allowing when starting after the border, or ending before it.
+        if (initial.column > option || final.column < option) {
+          return
+        }
 
-      // Not allowing when starting after the border, or ending before it.
-      if (initial.column > preferred || final.column < preferred) {
-        return
-      }
+        const next = parent.children[pos + 1]
 
-      const next = parent.children[pos + 1]
+        // Not allowing when there’s whitespace after the link.
+        if (
+          next &&
+          pointStart(next).line === initial.line &&
+          (!('value' in next) || /^(.+?[ \t].+?)/.test(next.value))
+        ) {
+          return
+        }
 
-      // Not allowing when there’s whitespace after the link.
-      if (
-        next &&
-        pointStart(next).line === initial.line &&
-        (!next.value || /^(.+?[ \t].+?)/.test(next.value))
-      ) {
-        return
+        allowList(initial.line - 1, final.line)
       }
+    })
 
-      allowList(initial.line - 1, final.line)
-    }
-  })
-
-  // Iterate over every line, and warn for violating lines.
-  let index = -1
+    // Iterate over every line, and warn for violating lines.
+    let index = -1
 
-  while (++index < lines.length) {
-    const lineLength = lines[index].length
+    while (++index < lines.length) {
+      const lineLength = lines[index].length
 
-    if (lineLength > preferred) {
-      file.message('Line must be at most ' + preferred + ' characters', {
-        line: index + 1,
-        column: lineLength + 1
-      })
+      if (lineLength > option) {
+        file.message('Line must be at most ' + option + ' characters', {
+          line: index + 1,
+          column: lineLength + 1
+        })
+      }
     }
-  }
 
-  // Allowlist from `initial` to `final`, zero-based.
-  function allowList(initial, final) {
-    while (initial < final) {
-      lines[initial++] = ''
+    /**
+     * Allowlist from `initial` to `final`, zero-based.
+     *
+     * @param {number} initial
+     * @param {number} final
+     */
+    function allowList(initial, final) {
+      while (initial < final) {
+        lines[initial++] = ''
+      }
     }
   }
-}
+)
+
+export default remarkLintMaximumLineLength
diff --git a/packages/remark-lint-maximum-line-length/package.json b/packages/remark-lint-maximum-line-length/package.json
index f369dbfa..b8811f68 100644
--- a/packages/remark-lint-maximum-line-length/package.json
+++ b/packages/remark-lint-maximum-line-length/package.json
@@ -24,14 +24,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-maximum-line-length/readme.md b/packages/remark-lint-maximum-line-length/readme.md
index 3aa61882..4c1ec60c 100644
--- a/packages/remark-lint-maximum-line-length/readme.md
+++ b/packages/remark-lint-maximum-line-length/readme.md
@@ -151,12 +151,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-maximum-line-length
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintMaximumLineLength`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -237,6 +243,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-maximum-line-length/tsconfig.json b/packages/remark-lint-maximum-line-length/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-maximum-line-length/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-auto-link-without-protocol/index.js b/packages/remark-lint-no-auto-link-without-protocol/index.js
index 1e2f1425..a3150cef 100644
--- a/packages/remark-lint-no-auto-link-without-protocol/index.js
+++ b/packages/remark-lint-no-auto-link-without-protocol/index.js
@@ -36,6 +36,10 @@
  *   1:1-1:14: All automatic links must start with a protocol
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
@@ -48,6 +52,7 @@ const protocol = /^[a-z][a-z+.-]+:\/?/i
 
 const remarkLintNoAutoLinkWithoutProtocol = lintRule(
   'remark-lint:no-auto-link-without-protocol',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'link', (node) => {
       if (
diff --git a/packages/remark-lint-no-auto-link-without-protocol/package.json b/packages/remark-lint-no-auto-link-without-protocol/package.json
index 9be8aafe..e6d1d72a 100644
--- a/packages/remark-lint-no-auto-link-without-protocol/package.json
+++ b/packages/remark-lint-no-auto-link-without-protocol/package.json
@@ -25,15 +25,28 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "mdast-util-to-string": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-auto-link-without-protocol/readme.md b/packages/remark-lint-no-auto-link-without-protocol/readme.md
index 55d9ed4d..3bde196b 100644
--- a/packages/remark-lint-no-auto-link-without-protocol/readme.md
+++ b/packages/remark-lint-no-auto-link-without-protocol/readme.md
@@ -65,12 +65,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-auto-link-without-protocol
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoAutoLinkWithoutProtocol`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -151,6 +157,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-auto-link-without-protocol/tsconfig.json b/packages/remark-lint-no-auto-link-without-protocol/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-auto-link-without-protocol/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-blockquote-without-marker/index.js b/packages/remark-lint-no-blockquote-without-marker/index.js
index e22e168b..05600b5e 100644
--- a/packages/remark-lint-no-blockquote-without-marker/index.js
+++ b/packages/remark-lint-no-blockquote-without-marker/index.js
@@ -55,6 +55,10 @@
  *   3:1: Missing marker in block quote
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {location} from 'vfile-location'
 import {visit} from 'unist-util-visit'
@@ -63,6 +67,7 @@ import {generated} from 'unist-util-generated'
 
 const remarkLintNoBlockquoteWithoutMarker = lintRule(
   'remark-lint:no-blockquote-without-marker',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
     const loc = location(file)
diff --git a/packages/remark-lint-no-blockquote-without-marker/package.json b/packages/remark-lint-no-blockquote-without-marker/package.json
index c9a71fae..974bd7e8 100644
--- a/packages/remark-lint-no-blockquote-without-marker/package.json
+++ b/packages/remark-lint-no-blockquote-without-marker/package.json
@@ -25,15 +25,28 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0",
     "vfile-location": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-blockquote-without-marker/readme.md b/packages/remark-lint-no-blockquote-without-marker/readme.md
index 08fe4350..e92b484d 100644
--- a/packages/remark-lint-no-blockquote-without-marker/readme.md
+++ b/packages/remark-lint-no-blockquote-without-marker/readme.md
@@ -99,12 +99,18 @@ Note: `»` represents a tab.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-blockquote-without-marker
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoBlockquoteWithoutMarker`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -185,6 +191,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-blockquote-without-marker/tsconfig.json b/packages/remark-lint-no-blockquote-without-marker/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-blockquote-without-marker/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-consecutive-blank-lines/index.js b/packages/remark-lint-no-consecutive-blank-lines/index.js
index 2e252c23..6cd97186 100644
--- a/packages/remark-lint-no-consecutive-blank-lines/index.js
+++ b/packages/remark-lint-no-consecutive-blank-lines/index.js
@@ -44,6 +44,11 @@
  *   4:5: Remove 2 lines after node
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('unist').Point} Point
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import plural from 'pluralize'
 import {visit} from 'unist-util-visit'
@@ -52,6 +57,7 @@ import {generated} from 'unist-util-generated'
 
 const remarkLintNoConsecutiveBlankLines = lintRule(
   'remark-lint:no-consecutive-blank-lines',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, (node) => {
       if (!generated(node) && 'children' in node) {
@@ -83,8 +89,14 @@ const remarkLintNoConsecutiveBlankLines = lintRule(
       }
     })
 
-    // Compare the difference between `start` and `end`, and warn when that
-    // difference exceeds `max`.
+    /**
+     * Compare the difference between `start` and `end`, and warn when that
+     * difference exceeds `max`.
+     *
+     * @param {Point} start
+     * @param {Point} end
+     * @param {0|1|2} max
+     */
     function compare(start, end, max) {
       const diff = end.line - start.line
       const lines = Math.abs(diff) - max
diff --git a/packages/remark-lint-no-consecutive-blank-lines/package.json b/packages/remark-lint-no-consecutive-blank-lines/package.json
index 36d79ad8..9fe32389 100644
--- a/packages/remark-lint-no-consecutive-blank-lines/package.json
+++ b/packages/remark-lint-no-consecutive-blank-lines/package.json
@@ -24,15 +24,29 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "@types/unist": "^2.0.0",
     "pluralize": "^8.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-consecutive-blank-lines/readme.md b/packages/remark-lint-no-consecutive-blank-lines/readme.md
index fc84c359..0e111af2 100644
--- a/packages/remark-lint-no-consecutive-blank-lines/readme.md
+++ b/packages/remark-lint-no-consecutive-blank-lines/readme.md
@@ -79,12 +79,18 @@ Foo…
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-consecutive-blank-lines
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoConsecutiveBlankLines`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -165,6 +171,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-consecutive-blank-lines/tsconfig.json b/packages/remark-lint-no-consecutive-blank-lines/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-consecutive-blank-lines/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-duplicate-defined-urls/index.js b/packages/remark-lint-no-duplicate-defined-urls/index.js
index bbcd568c..ca9fcde0 100644
--- a/packages/remark-lint-no-duplicate-defined-urls/index.js
+++ b/packages/remark-lint-no-duplicate-defined-urls/index.js
@@ -24,6 +24,10 @@
  *   2:1-2:19: Do not use different definitions with the same URL (1:1)
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {pointStart} from 'unist-util-position'
 import {generated} from 'unist-util-generated'
@@ -32,7 +36,9 @@ import {visit} from 'unist-util-visit'
 
 const remarkLintNoDuplicateDefinedUrls = lintRule(
   'remark-lint:no-duplicate-defined-urls',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
+    /** @type {Record<string, string>} */
     const map = Object.create(null)
 
     visit(tree, 'definition', (node) => {
@@ -43,13 +49,13 @@ const remarkLintNoDuplicateDefinedUrls = lintRule(
         if (duplicate) {
           file.message(
             'Do not use different definitions with the same URL (' +
-              stringifyPosition(pointStart(duplicate)) +
+              duplicate +
               ')',
             node
           )
         }
 
-        map[url] = node
+        map[url] = stringifyPosition(pointStart(node))
       }
     })
   }
diff --git a/packages/remark-lint-no-duplicate-defined-urls/package.json b/packages/remark-lint-no-duplicate-defined-urls/package.json
index f27c93db..4218d614 100644
--- a/packages/remark-lint-no-duplicate-defined-urls/package.json
+++ b/packages/remark-lint-no-duplicate-defined-urls/package.json
@@ -25,15 +25,28 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-stringify-position": "^3.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-duplicate-defined-urls/readme.md b/packages/remark-lint-no-duplicate-defined-urls/readme.md
index 36dc1d1d..12c10009 100644
--- a/packages/remark-lint-no-duplicate-defined-urls/readme.md
+++ b/packages/remark-lint-no-duplicate-defined-urls/readme.md
@@ -48,12 +48,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-duplicate-defined-urls
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoDuplicateDefinedUrls`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -134,6 +140,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-duplicate-defined-urls/tsconfig.json b/packages/remark-lint-no-duplicate-defined-urls/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-duplicate-defined-urls/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-duplicate-definitions/index.js b/packages/remark-lint-no-duplicate-definitions/index.js
index 43c2a7d1..68ff27a7 100644
--- a/packages/remark-lint-no-duplicate-definitions/index.js
+++ b/packages/remark-lint-no-duplicate-definitions/index.js
@@ -24,6 +24,10 @@
  *   2:1-2:11: Do not use definitions with the same identifier (1:1)
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {pointStart} from 'unist-util-position'
 import {generated} from 'unist-util-generated'
@@ -32,7 +36,9 @@ import {visit} from 'unist-util-visit'
 
 const remarkLintNoDuplicateDefinitions = lintRule(
   'remark-lint:no-duplicate-definitions',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
+    /** @type {Record<string, string>} */
     const map = Object.create(null)
 
     visit(tree, (node) => {
@@ -46,13 +52,13 @@ const remarkLintNoDuplicateDefinitions = lintRule(
         if (duplicate) {
           file.message(
             'Do not use definitions with the same identifier (' +
-              stringifyPosition(pointStart(duplicate)) +
+              duplicate +
               ')',
             node
           )
         }
 
-        map[identifier] = node
+        map[identifier] = stringifyPosition(pointStart(node))
       }
     })
   }
diff --git a/packages/remark-lint-no-duplicate-definitions/package.json b/packages/remark-lint-no-duplicate-definitions/package.json
index 8fbdde23..75621e34 100644
--- a/packages/remark-lint-no-duplicate-definitions/package.json
+++ b/packages/remark-lint-no-duplicate-definitions/package.json
@@ -24,15 +24,28 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-stringify-position": "^3.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-duplicate-definitions/readme.md b/packages/remark-lint-no-duplicate-definitions/readme.md
index f33cc67b..52997bf9 100644
--- a/packages/remark-lint-no-duplicate-definitions/readme.md
+++ b/packages/remark-lint-no-duplicate-definitions/readme.md
@@ -52,12 +52,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-duplicate-definitions
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoDuplicateDefinitions`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -138,6 +144,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-duplicate-definitions/tsconfig.json b/packages/remark-lint-no-duplicate-definitions/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-duplicate-definitions/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-duplicate-headings-in-section/index.js b/packages/remark-lint-no-duplicate-headings-in-section/index.js
index 3b327784..46b0da3d 100644
--- a/packages/remark-lint-no-duplicate-headings-in-section/index.js
+++ b/packages/remark-lint-no-duplicate-headings-in-section/index.js
@@ -59,6 +59,11 @@
  *   7:1-7:11: Do not use headings with similar content per section (3:1)
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').Heading} Heading
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {pointStart} from 'unist-util-position'
 import {generated} from 'unist-util-generated'
@@ -68,7 +73,9 @@ import {toString} from 'mdast-util-to-string'
 
 const remarkLintNoDuplicateHeadingsInSection = lintRule(
   'remark-lint:no-duplicate-headings-in-section',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
+    /** @type {Array.<Record<string, Heading>>} */
     let stack = []
 
     visit(tree, 'heading', (node) => {
diff --git a/packages/remark-lint-no-duplicate-headings-in-section/package.json b/packages/remark-lint-no-duplicate-headings-in-section/package.json
index d622e93a..ee964de1 100644
--- a/packages/remark-lint-no-duplicate-headings-in-section/package.json
+++ b/packages/remark-lint-no-duplicate-headings-in-section/package.json
@@ -25,16 +25,29 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "mdast-util-to-string": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-stringify-position": "^3.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-duplicate-headings-in-section/readme.md b/packages/remark-lint-no-duplicate-headings-in-section/readme.md
index a8af562c..d23536ef 100644
--- a/packages/remark-lint-no-duplicate-headings-in-section/readme.md
+++ b/packages/remark-lint-no-duplicate-headings-in-section/readme.md
@@ -87,12 +87,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-duplicate-headings-in-section
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoDuplicateHeadingsInSection`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -173,6 +179,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-duplicate-headings-in-section/tsconfig.json b/packages/remark-lint-no-duplicate-headings-in-section/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-duplicate-headings-in-section/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-duplicate-headings/index.js b/packages/remark-lint-no-duplicate-headings/index.js
index 3e1d6e05..c02fbd25 100644
--- a/packages/remark-lint-no-duplicate-headings/index.js
+++ b/packages/remark-lint-no-duplicate-headings/index.js
@@ -29,6 +29,10 @@
  *   5:1-5:29: Do not use headings with similar content (3:1)
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {pointStart} from 'unist-util-position'
 import {generated} from 'unist-util-generated'
@@ -38,7 +42,9 @@ import {toString} from 'mdast-util-to-string'
 
 const remarkLintNoDuplicateHeadings = lintRule(
   'remark-lint:no-duplicate-headings',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
+    /** @type {Record<string, string>} */
     const map = Object.create(null)
 
     visit(tree, 'heading', (node) => {
@@ -48,14 +54,12 @@ const remarkLintNoDuplicateHeadings = lintRule(
 
         if (duplicate) {
           file.message(
-            'Do not use headings with similar content (' +
-              stringifyPosition(pointStart(duplicate)) +
-              ')',
+            'Do not use headings with similar content (' + duplicate + ')',
             node
           )
         }
 
-        map[value] = node
+        map[value] = stringifyPosition(pointStart(node))
       }
     })
   }
diff --git a/packages/remark-lint-no-duplicate-headings/package.json b/packages/remark-lint-no-duplicate-headings/package.json
index 34e889b7..20d254a7 100644
--- a/packages/remark-lint-no-duplicate-headings/package.json
+++ b/packages/remark-lint-no-duplicate-headings/package.json
@@ -24,16 +24,29 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "mdast-util-to-string": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-stringify-position": "^3.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-duplicate-headings/readme.md b/packages/remark-lint-no-duplicate-headings/readme.md
index 27587619..52407cfd 100644
--- a/packages/remark-lint-no-duplicate-headings/readme.md
+++ b/packages/remark-lint-no-duplicate-headings/readme.md
@@ -57,12 +57,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-duplicate-headings
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoDuplicateHeadings`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -143,6 +149,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-duplicate-headings/tsconfig.json b/packages/remark-lint-no-duplicate-headings/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-duplicate-headings/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-emphasis-as-heading/index.js b/packages/remark-lint-no-emphasis-as-heading/index.js
index 8f8632a1..92756a23 100644
--- a/packages/remark-lint-no-emphasis-as-heading/index.js
+++ b/packages/remark-lint-no-emphasis-as-heading/index.js
@@ -32,30 +32,41 @@
  *   5:1-5:8: Don’t use emphasis to introduce a section, use a heading
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
 
 const remarkLintNoEmphasisAsHeading = lintRule(
   'remark-lint:no-emphasis-as-heading',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'paragraph', (node, index, parent) => {
       const head = node.children[0]
-      const previous = parent.children[index - 1]
-      const next = parent.children[index + 1]
 
       if (
+        parent &&
+        typeof index === 'number' &&
         !generated(node) &&
-        (!previous || previous.type !== 'heading') &&
-        next &&
-        next.type === 'paragraph' &&
         node.children.length === 1 &&
         (head.type === 'emphasis' || head.type === 'strong')
       ) {
-        file.message(
-          'Don’t use emphasis to introduce a section, use a heading',
-          node
-        )
+        const previous = parent.children[index - 1]
+        const next = parent.children[index + 1]
+
+        if (
+          (!previous || previous.type !== 'heading') &&
+          next &&
+          next.type === 'paragraph'
+        ) {
+          file.message(
+            'Don’t use emphasis to introduce a section, use a heading',
+            node
+          )
+        }
       }
     })
   }
diff --git a/packages/remark-lint-no-emphasis-as-heading/package.json b/packages/remark-lint-no-emphasis-as-heading/package.json
index 957d1010..f0967990 100644
--- a/packages/remark-lint-no-emphasis-as-heading/package.json
+++ b/packages/remark-lint-no-emphasis-as-heading/package.json
@@ -24,13 +24,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-emphasis-as-heading/readme.md b/packages/remark-lint-no-emphasis-as-heading/readme.md
index 46f4c52f..9f196084 100644
--- a/packages/remark-lint-no-emphasis-as-heading/readme.md
+++ b/packages/remark-lint-no-emphasis-as-heading/readme.md
@@ -60,12 +60,18 @@ Quux.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-emphasis-as-heading
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoEmphasisAsHeading`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -146,6 +152,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-emphasis-as-heading/tsconfig.json b/packages/remark-lint-no-emphasis-as-heading/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-emphasis-as-heading/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-empty-url/index.js b/packages/remark-lint-no-empty-url/index.js
index 83704535..59d1ffce 100644
--- a/packages/remark-lint-no-empty-url/index.js
+++ b/packages/remark-lint-no-empty-url/index.js
@@ -27,12 +27,17 @@
  *   3:1-3:11: Don’t use images without URL
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
 
 const remarkLintNoEmptyUrl = lintRule(
   'remark-lint:no-empty-url',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, (node) => {
       if (
diff --git a/packages/remark-lint-no-empty-url/package.json b/packages/remark-lint-no-empty-url/package.json
index 40c967cd..9cb04591 100644
--- a/packages/remark-lint-no-empty-url/package.json
+++ b/packages/remark-lint-no-empty-url/package.json
@@ -26,13 +26,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-empty-url/readme.md b/packages/remark-lint-no-empty-url/readme.md
index 6eee767a..486c5456 100644
--- a/packages/remark-lint-no-empty-url/readme.md
+++ b/packages/remark-lint-no-empty-url/readme.md
@@ -51,12 +51,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-empty-url
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoEmptyUrl`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -137,6 +143,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-empty-url/tsconfig.json b/packages/remark-lint-no-empty-url/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-empty-url/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-file-name-articles/index.js b/packages/remark-lint-no-file-name-articles/index.js
index 23160349..c53b692f 100644
--- a/packages/remark-lint-no-file-name-articles/index.js
+++ b/packages/remark-lint-no-file-name-articles/index.js
@@ -30,11 +30,16 @@
  *   1:1: Do not start file names with `an`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 
 const remarkLintNoFileNameArticles = lintRule(
   'remark-lint:no-file-name-articles',
-  (tree, file) => {
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
+  (_, file) => {
     const match = file.stem && file.stem.match(/^(the|teh|an?)\b/i)
 
     if (match) {
diff --git a/packages/remark-lint-no-file-name-articles/package.json b/packages/remark-lint-no-file-name-articles/package.json
index 5a0e0663..6c400464 100644
--- a/packages/remark-lint-no-file-name-articles/package.json
+++ b/packages/remark-lint-no-file-name-articles/package.json
@@ -26,11 +26,24 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-file-name-articles/readme.md b/packages/remark-lint-no-file-name-articles/readme.md
index f0945e19..41913a37 100644
--- a/packages/remark-lint-no-file-name-articles/readme.md
+++ b/packages/remark-lint-no-file-name-articles/readme.md
@@ -62,12 +62,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-file-name-articles
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoFileNameArticles`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -148,6 +154,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-file-name-articles/tsconfig.json b/packages/remark-lint-no-file-name-articles/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-file-name-articles/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-file-name-consecutive-dashes/index.js b/packages/remark-lint-no-file-name-consecutive-dashes/index.js
index 4c30ad44..8bf292fb 100644
--- a/packages/remark-lint-no-file-name-consecutive-dashes/index.js
+++ b/packages/remark-lint-no-file-name-consecutive-dashes/index.js
@@ -15,11 +15,16 @@
  *   1:1: Do not use consecutive dashes in a file name
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 
 const remarkLintNoFileNameConsecutiveDashes = lintRule(
   'remark-lint:no-file-name-consecutive-dashes',
-  (tree, file) => {
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
+  (_, file) => {
     if (file.stem && /-{2,}/.test(file.stem)) {
       file.message('Do not use consecutive dashes in a file name')
     }
diff --git a/packages/remark-lint-no-file-name-consecutive-dashes/package.json b/packages/remark-lint-no-file-name-consecutive-dashes/package.json
index 96454314..defafb9b 100644
--- a/packages/remark-lint-no-file-name-consecutive-dashes/package.json
+++ b/packages/remark-lint-no-file-name-consecutive-dashes/package.json
@@ -27,11 +27,24 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-file-name-consecutive-dashes/readme.md b/packages/remark-lint-no-file-name-consecutive-dashes/readme.md
index fa2277dc..a5589e7e 100644
--- a/packages/remark-lint-no-file-name-consecutive-dashes/readme.md
+++ b/packages/remark-lint-no-file-name-consecutive-dashes/readme.md
@@ -38,12 +38,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-file-name-consecutive-dashes
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoFileNameConsecutiveDashes`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -124,6 +130,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-file-name-consecutive-dashes/tsconfig.json b/packages/remark-lint-no-file-name-consecutive-dashes/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-file-name-consecutive-dashes/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-file-name-irregular-characters/index.js b/packages/remark-lint-no-file-name-irregular-characters/index.js
index c7f27b32..8e697a78 100644
--- a/packages/remark-lint-no-file-name-irregular-characters/index.js
+++ b/packages/remark-lint-no-file-name-irregular-characters/index.js
@@ -37,13 +37,20 @@
  *   1:1: Do not use ` ` in a file name
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ *
+ * @typedef {RegExp|string} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 
 const expression = /[^\\.a-zA-Z\d-]/
 
 const remarkLintNoFileNameIrregularCharacters = lintRule(
   'remark-lint:no-file-name-irregular-characters',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (_, file, option) => {
     let preferred = option || expression
 
     if (typeof preferred === 'string') {
diff --git a/packages/remark-lint-no-file-name-irregular-characters/package.json b/packages/remark-lint-no-file-name-irregular-characters/package.json
index 193b800a..bf5cad7e 100644
--- a/packages/remark-lint-no-file-name-irregular-characters/package.json
+++ b/packages/remark-lint-no-file-name-irregular-characters/package.json
@@ -26,11 +26,24 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-file-name-irregular-characters/readme.md b/packages/remark-lint-no-file-name-irregular-characters/readme.md
index 704505c8..5901269e 100644
--- a/packages/remark-lint-no-file-name-irregular-characters/readme.md
+++ b/packages/remark-lint-no-file-name-irregular-characters/readme.md
@@ -71,12 +71,18 @@ When configured with `'\\.a-z0-9'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-file-name-irregular-characters
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoFileNameIrregularCharacters`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -157,6 +163,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-file-name-irregular-characters/tsconfig.json b/packages/remark-lint-no-file-name-irregular-characters/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-file-name-irregular-characters/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-file-name-mixed-case/index.js b/packages/remark-lint-no-file-name-mixed-case/index.js
index 04823d78..ab687561 100644
--- a/packages/remark-lint-no-file-name-mixed-case/index.js
+++ b/packages/remark-lint-no-file-name-mixed-case/index.js
@@ -18,11 +18,16 @@
  *   1:1: Do not mix casing in file names
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 
 const remarkLintNofileNameMixedCase = lintRule(
   'remark-lint:no-file-name-mixed-case',
-  (tree, file) => {
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
+  (_, file) => {
     const name = file.stem
 
     if (name && !(name === name.toLowerCase() || name === name.toUpperCase())) {
diff --git a/packages/remark-lint-no-file-name-mixed-case/package.json b/packages/remark-lint-no-file-name-mixed-case/package.json
index da96a49e..aab64648 100644
--- a/packages/remark-lint-no-file-name-mixed-case/package.json
+++ b/packages/remark-lint-no-file-name-mixed-case/package.json
@@ -25,11 +25,24 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-file-name-mixed-case/readme.md b/packages/remark-lint-no-file-name-mixed-case/readme.md
index 66114921..9af8acbd 100644
--- a/packages/remark-lint-no-file-name-mixed-case/readme.md
+++ b/packages/remark-lint-no-file-name-mixed-case/readme.md
@@ -44,12 +44,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-file-name-mixed-case
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoFileNameMixedCase`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -130,6 +136,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-file-name-mixed-case/tsconfig.json b/packages/remark-lint-no-file-name-mixed-case/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-file-name-mixed-case/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-file-name-outer-dashes/index.js b/packages/remark-lint-no-file-name-outer-dashes/index.js
index 22220d61..9558b1b5 100644
--- a/packages/remark-lint-no-file-name-outer-dashes/index.js
+++ b/packages/remark-lint-no-file-name-outer-dashes/index.js
@@ -20,11 +20,16 @@
  *   1:1: Do not use initial or final dashes in a file name
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 
 const remarkLintNofileNameOuterDashes = lintRule(
   'remark-lint:no-file-name-outer-dashes',
-  (tree, file) => {
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
+  (_, file) => {
     if (file.stem && /^-|-$/.test(file.stem)) {
       file.message('Do not use initial or final dashes in a file name')
     }
diff --git a/packages/remark-lint-no-file-name-outer-dashes/package.json b/packages/remark-lint-no-file-name-outer-dashes/package.json
index 19f4282c..738f0645 100644
--- a/packages/remark-lint-no-file-name-outer-dashes/package.json
+++ b/packages/remark-lint-no-file-name-outer-dashes/package.json
@@ -26,11 +26,24 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-file-name-outer-dashes/readme.md b/packages/remark-lint-no-file-name-outer-dashes/readme.md
index 532b68cc..270d1891 100644
--- a/packages/remark-lint-no-file-name-outer-dashes/readme.md
+++ b/packages/remark-lint-no-file-name-outer-dashes/readme.md
@@ -46,12 +46,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-file-name-outer-dashes
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoFileNameOuterDashes`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -132,6 +138,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-file-name-outer-dashes/tsconfig.json b/packages/remark-lint-no-file-name-outer-dashes/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-file-name-outer-dashes/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-heading-content-indent/index.js b/packages/remark-lint-no-heading-content-indent/index.js
index d54062cf..362f79c4 100644
--- a/packages/remark-lint-no-heading-content-indent/index.js
+++ b/packages/remark-lint-no-heading-content-indent/index.js
@@ -50,6 +50,10 @@
  *   #··
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {headingStyle} from 'mdast-util-heading-style'
@@ -59,6 +63,7 @@ import {generated} from 'unist-util-generated'
 
 const remarkLintNoHeadingContentIndent = lintRule(
   'remark-lint:no-heading-content-indent',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'heading', (node) => {
       if (generated(node)) {
diff --git a/packages/remark-lint-no-heading-content-indent/package.json b/packages/remark-lint-no-heading-content-indent/package.json
index 08e63128..5665b595 100644
--- a/packages/remark-lint-no-heading-content-indent/package.json
+++ b/packages/remark-lint-no-heading-content-indent/package.json
@@ -25,16 +25,29 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "mdast-util-heading-style": "^2.0.0",
     "pluralize": "^8.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-heading-content-indent/readme.md b/packages/remark-lint-no-heading-content-indent/readme.md
index c4803c4b..a93eeba4 100644
--- a/packages/remark-lint-no-heading-content-indent/readme.md
+++ b/packages/remark-lint-no-heading-content-indent/readme.md
@@ -91,12 +91,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-heading-content-indent
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoHeadingContentIndent`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -177,6 +183,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-heading-content-indent/tsconfig.json b/packages/remark-lint-no-heading-content-indent/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-heading-content-indent/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-heading-indent/index.js b/packages/remark-lint-no-heading-indent/index.js
index 0e58afbd..0a106b94 100644
--- a/packages/remark-lint-no-heading-indent/index.js
+++ b/packages/remark-lint-no-heading-indent/index.js
@@ -49,6 +49,10 @@
  *   8:4: Remove 3 spaces before this heading
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import plural from 'pluralize'
 import {visit} from 'unist-util-visit'
@@ -57,6 +61,7 @@ import {generated} from 'unist-util-generated'
 
 const remarkLintNoHeadingIndent = lintRule(
   'remark-lint:no-heading-indent',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'heading', (node, _, parent) => {
       // Note: it’s rather complex to detect what the expected indent is in block
diff --git a/packages/remark-lint-no-heading-indent/package.json b/packages/remark-lint-no-heading-indent/package.json
index 37258a16..7581d401 100644
--- a/packages/remark-lint-no-heading-indent/package.json
+++ b/packages/remark-lint-no-heading-indent/package.json
@@ -24,15 +24,28 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "pluralize": "^8.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-heading-indent/readme.md b/packages/remark-lint-no-heading-indent/readme.md
index b345f173..e57fc6c8 100644
--- a/packages/remark-lint-no-heading-indent/readme.md
+++ b/packages/remark-lint-no-heading-indent/readme.md
@@ -77,12 +77,18 @@ Note: `·` represents a space.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-heading-indent
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoHeadingIndent`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -163,6 +169,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-heading-indent/tsconfig.json b/packages/remark-lint-no-heading-indent/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-heading-indent/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-heading-like-paragraph/index.js b/packages/remark-lint-no-heading-like-paragraph/index.js
index 48d8a66b..8f4b917e 100644
--- a/packages/remark-lint-no-heading-like-paragraph/index.js
+++ b/packages/remark-lint-no-heading-like-paragraph/index.js
@@ -26,6 +26,10 @@
  *   1:1-1:16: This looks like a heading but has too many hashes
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
@@ -34,6 +38,7 @@ const fence = '#######'
 
 const remarkLintNoHeadingLikeParagraph = lintRule(
   'remark-lint:no-heading-like-paragraph',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'paragraph', (node) => {
       if (!generated(node)) {
diff --git a/packages/remark-lint-no-heading-like-paragraph/package.json b/packages/remark-lint-no-heading-like-paragraph/package.json
index ac4512e3..c698dc1e 100644
--- a/packages/remark-lint-no-heading-like-paragraph/package.json
+++ b/packages/remark-lint-no-heading-like-paragraph/package.json
@@ -24,13 +24,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-heading-like-paragraph/readme.md b/packages/remark-lint-no-heading-like-paragraph/readme.md
index ad66e130..8503ba80 100644
--- a/packages/remark-lint-no-heading-like-paragraph/readme.md
+++ b/packages/remark-lint-no-heading-like-paragraph/readme.md
@@ -50,12 +50,18 @@ Delta.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-heading-like-paragraph
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoHeadingLikeParagraph`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -136,6 +142,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-heading-like-paragraph/tsconfig.json b/packages/remark-lint-no-heading-like-paragraph/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-heading-like-paragraph/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-heading-punctuation/index.js b/packages/remark-lint-no-heading-punctuation/index.js
index 56ee9a7f..aa012f30 100644
--- a/packages/remark-lint-no-heading-punctuation/index.js
+++ b/packages/remark-lint-no-heading-punctuation/index.js
@@ -44,19 +44,21 @@
  *   9:1-9:9: Don’t add a trailing `;` to headings
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {string} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
 import {toString} from 'mdast-util-to-string'
 
-const defaults = '\\.,;:!?'
-
 const remarkLintNoHeadingPunctuation = lintRule(
   'remark-lint:no-heading-punctuation',
-  (tree, file, option) => {
-    const expression = new RegExp(
-      '[' + (typeof option === 'string' ? option : defaults) + ']'
-    )
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = '\\.,;:!?') => {
+    const expression = new RegExp('[' + option + ']')
 
     visit(tree, 'heading', (node) => {
       if (!generated(node)) {
diff --git a/packages/remark-lint-no-heading-punctuation/package.json b/packages/remark-lint-no-heading-punctuation/package.json
index d817d7b4..d7a01283 100644
--- a/packages/remark-lint-no-heading-punctuation/package.json
+++ b/packages/remark-lint-no-heading-punctuation/package.json
@@ -24,14 +24,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
-    "unified-lint-rule": "^1.0.0",
+    "@types/mdast": "^3.0.0",
     "mdast-util-to-string": "^3.0.0",
+    "unified": "^10.0.0",
+    "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-heading-punctuation/readme.md b/packages/remark-lint-no-heading-punctuation/readme.md
index b7bbe47d..b5719dcb 100644
--- a/packages/remark-lint-no-heading-punctuation/readme.md
+++ b/packages/remark-lint-no-heading-punctuation/readme.md
@@ -81,12 +81,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-heading-punctuation
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoHeadingPunctuation`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -167,6 +173,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-heading-punctuation/tsconfig.json b/packages/remark-lint-no-heading-punctuation/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-heading-punctuation/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-html/index.js b/packages/remark-lint-no-html/index.js
index a2716c64..6af0dec8 100644
--- a/packages/remark-lint-no-html/index.js
+++ b/packages/remark-lint-no-html/index.js
@@ -27,16 +27,24 @@
  *   1:1-1:15: Do not use HTML in markdown
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
 
-const remarkLintNoHtml = lintRule('remark-lint:no-html', (tree, file) => {
-  visit(tree, 'html', (node) => {
-    if (!generated(node) && !/^\s*<!--/.test(node.value)) {
-      file.message('Do not use HTML in markdown', node)
-    }
-  })
-})
+const remarkLintNoHtml = lintRule(
+  'remark-lint:no-html',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
+  (tree, file) => {
+    visit(tree, 'html', (node) => {
+      if (!generated(node) && !/^\s*<!--/.test(node.value)) {
+        file.message('Do not use HTML in markdown', node)
+      }
+    })
+  }
+)
 
 export default remarkLintNoHtml
diff --git a/packages/remark-lint-no-html/package.json b/packages/remark-lint-no-html/package.json
index 6dd7d79b..0c47f098 100644
--- a/packages/remark-lint-no-html/package.json
+++ b/packages/remark-lint-no-html/package.json
@@ -23,13 +23,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-html/readme.md b/packages/remark-lint-no-html/readme.md
index e6d293ab..1d7bef34 100644
--- a/packages/remark-lint-no-html/readme.md
+++ b/packages/remark-lint-no-html/readme.md
@@ -51,12 +51,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-html
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoHtml`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -137,6 +143,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-html/tsconfig.json b/packages/remark-lint-no-html/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-html/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-inline-padding/index.js b/packages/remark-lint-no-inline-padding/index.js
index 47d55940..174ef2ac 100644
--- a/packages/remark-lint-no-inline-padding/index.js
+++ b/packages/remark-lint-no-inline-padding/index.js
@@ -25,6 +25,10 @@
  *   1:7-1:38: Don’t pad `link` with inner spaces
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
@@ -32,6 +36,7 @@ import {toString} from 'mdast-util-to-string'
 
 const remarkLintNoInlinePadding = lintRule(
   'remark-lint:no-inline-padding',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     // Note: `emphasis`, `strong`, `delete` (GFM) can’t have padding anymore
     // since CM.
diff --git a/packages/remark-lint-no-inline-padding/package.json b/packages/remark-lint-no-inline-padding/package.json
index ef78e06a..b0f01994 100644
--- a/packages/remark-lint-no-inline-padding/package.json
+++ b/packages/remark-lint-no-inline-padding/package.json
@@ -24,14 +24,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "mdast-util-to-string": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-inline-padding/readme.md b/packages/remark-lint-no-inline-padding/readme.md
index 585a0851..af816912 100644
--- a/packages/remark-lint-no-inline-padding/readme.md
+++ b/packages/remark-lint-no-inline-padding/readme.md
@@ -54,12 +54,18 @@ Alpha [ bravo ](http://echo.fox/trot)
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-inline-padding
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoInlinePadding`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -140,6 +146,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-inline-padding/tsconfig.json b/packages/remark-lint-no-inline-padding/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-inline-padding/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-literal-urls/index.js b/packages/remark-lint-no-literal-urls/index.js
index 56e9fa94..440a8d9b 100644
--- a/packages/remark-lint-no-literal-urls/index.js
+++ b/packages/remark-lint-no-literal-urls/index.js
@@ -34,6 +34,10 @@
  *   1:1-1:19: Don’t use literal URLs without angle brackets
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
@@ -42,6 +46,7 @@ import {toString} from 'mdast-util-to-string'
 
 const remarkLintNoLiteralUrls = lintRule(
   'remark-lint:no-literal-urls',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'link', (node) => {
       const value = toString(node)
diff --git a/packages/remark-lint-no-literal-urls/package.json b/packages/remark-lint-no-literal-urls/package.json
index c0b870cc..03a79884 100644
--- a/packages/remark-lint-no-literal-urls/package.json
+++ b/packages/remark-lint-no-literal-urls/package.json
@@ -24,15 +24,28 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "mdast-util-to-string": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-literal-urls/readme.md b/packages/remark-lint-no-literal-urls/readme.md
index 9b8595a9..206d5377 100644
--- a/packages/remark-lint-no-literal-urls/readme.md
+++ b/packages/remark-lint-no-literal-urls/readme.md
@@ -65,12 +65,18 @@ http://foo.bar/baz
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-literal-urls
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoLiteralUrls`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -151,6 +157,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-literal-urls/tsconfig.json b/packages/remark-lint-no-literal-urls/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-literal-urls/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-missing-blank-lines/index.js b/packages/remark-lint-no-missing-blank-lines/index.js
index fe416efd..e27cfb97 100644
--- a/packages/remark-lint-no-missing-blank-lines/index.js
+++ b/packages/remark-lint-no-missing-blank-lines/index.js
@@ -68,6 +68,13 @@
  *   2:1-2:7: Missing blank line before block node
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ *
+ * @typedef Options
+ * @property {boolean} [exceptTightLists=false]
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
@@ -87,12 +94,14 @@ const types = new Set([
 
 const remarkLintNoMissingBlankLines = lintRule(
   'remark-lint:no-missing-blank-lines',
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
   (tree, file, option = {}) => {
     const {exceptTightLists} = option
 
     visit(tree, (node, index, parent) => {
       if (
         parent &&
+        typeof index === 'number' &&
         !generated(node) &&
         (!exceptTightLists || parent.type !== 'listItem')
       ) {
diff --git a/packages/remark-lint-no-missing-blank-lines/package.json b/packages/remark-lint-no-missing-blank-lines/package.json
index 3ef35508..0f8a6f06 100644
--- a/packages/remark-lint-no-missing-blank-lines/package.json
+++ b/packages/remark-lint-no-missing-blank-lines/package.json
@@ -24,14 +24,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-missing-blank-lines/readme.md b/packages/remark-lint-no-missing-blank-lines/readme.md
index d21d389b..8d0068ac 100644
--- a/packages/remark-lint-no-missing-blank-lines/readme.md
+++ b/packages/remark-lint-no-missing-blank-lines/readme.md
@@ -98,12 +98,18 @@ Paragraph.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-missing-blank-lines
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoMissingBlankLines`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -184,6 +190,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-missing-blank-lines/tsconfig.json b/packages/remark-lint-no-missing-blank-lines/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-missing-blank-lines/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-multiple-toplevel-headings/index.js b/packages/remark-lint-no-multiple-toplevel-headings/index.js
index 8c36443c..7c16856c 100644
--- a/packages/remark-lint-no-multiple-toplevel-headings/index.js
+++ b/packages/remark-lint-no-multiple-toplevel-headings/index.js
@@ -28,6 +28,12 @@
  *   3:1-3:6: Don’t use multiple top level headings (1:1)
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').Heading} Heading
+ * @typedef {Heading['depth']} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
@@ -36,7 +42,9 @@ import {stringifyPosition} from 'unist-util-stringify-position'
 
 const remarkLintNoMultipleToplevelHeadings = lintRule(
   'remark-lint:no-multiple-toplevel-headings',
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
   (tree, file, option = 1) => {
+    /** @type {string|undefined} */
     let duplicate
 
     visit(tree, 'heading', (node) => {
diff --git a/packages/remark-lint-no-multiple-toplevel-headings/package.json b/packages/remark-lint-no-multiple-toplevel-headings/package.json
index dc8f4562..277a6e22 100644
--- a/packages/remark-lint-no-multiple-toplevel-headings/package.json
+++ b/packages/remark-lint-no-multiple-toplevel-headings/package.json
@@ -24,15 +24,28 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-stringify-position": "^3.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-multiple-toplevel-headings/readme.md b/packages/remark-lint-no-multiple-toplevel-headings/readme.md
index fe5ae55f..5bd6c7be 100644
--- a/packages/remark-lint-no-multiple-toplevel-headings/readme.md
+++ b/packages/remark-lint-no-multiple-toplevel-headings/readme.md
@@ -60,12 +60,18 @@ When configured with `1`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-multiple-toplevel-headings
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoMultipleToplevelHeadings`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -146,6 +152,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-multiple-toplevel-headings/tsconfig.json b/packages/remark-lint-no-multiple-toplevel-headings/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-multiple-toplevel-headings/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-paragraph-content-indent/index.js b/packages/remark-lint-no-paragraph-content-indent/index.js
index c8af585b..90443e5d 100644
--- a/packages/remark-lint-no-paragraph-content-indent/index.js
+++ b/packages/remark-lint-no-paragraph-content-indent/index.js
@@ -74,6 +74,10 @@
  *   22:4: Expected no indentation in paragraph content
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit, SKIP} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
@@ -81,6 +85,7 @@ import {location} from 'vfile-location'
 
 const remarkLintNoParagraphContentIndent = lintRule(
   'remark-lint:no-paragraph-content-indent',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
     const loc = location(value)
diff --git a/packages/remark-lint-no-paragraph-content-indent/package.json b/packages/remark-lint-no-paragraph-content-indent/package.json
index 58ecbf7b..51324e90 100644
--- a/packages/remark-lint-no-paragraph-content-indent/package.json
+++ b/packages/remark-lint-no-paragraph-content-indent/package.json
@@ -25,14 +25,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0",
     "vfile-location": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-paragraph-content-indent/readme.md b/packages/remark-lint-no-paragraph-content-indent/readme.md
index 51815ec9..3da44358 100644
--- a/packages/remark-lint-no-paragraph-content-indent/readme.md
+++ b/packages/remark-lint-no-paragraph-content-indent/readme.md
@@ -100,12 +100,18 @@ oscar
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-paragraph-content-indent
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoParagraphContentIndent`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -186,6 +192,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-paragraph-content-indent/tsconfig.json b/packages/remark-lint-no-paragraph-content-indent/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-paragraph-content-indent/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-reference-like-url/index.js b/packages/remark-lint-no-reference-like-url/index.js
index a40898de..2fed8843 100644
--- a/packages/remark-lint-no-reference-like-url/index.js
+++ b/packages/remark-lint-no-reference-like-url/index.js
@@ -26,13 +26,19 @@
  *   1:1-1:17: Did you mean to use `[delta]` instead of `(delta)`, a reference?
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {generated} from 'unist-util-generated'
 import {visit} from 'unist-util-visit'
 
 const remarkLintNoReferenceLikeUrl = lintRule(
   'remark-lint:no-reference-like-url',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
+    /** @type {string[]} */
     const identifiers = []
 
     visit(tree, 'definition', (node) => {
diff --git a/packages/remark-lint-no-reference-like-url/package.json b/packages/remark-lint-no-reference-like-url/package.json
index b65bf320..9e6edee7 100644
--- a/packages/remark-lint-no-reference-like-url/package.json
+++ b/packages/remark-lint-no-reference-like-url/package.json
@@ -25,13 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-reference-like-url/readme.md b/packages/remark-lint-no-reference-like-url/readme.md
index 571d67bc..3243a044 100644
--- a/packages/remark-lint-no-reference-like-url/readme.md
+++ b/packages/remark-lint-no-reference-like-url/readme.md
@@ -50,12 +50,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-reference-like-url
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoReferenceLikeUrl`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -136,6 +142,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-reference-like-url/tsconfig.json b/packages/remark-lint-no-reference-like-url/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-reference-like-url/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-shell-dollars/index.js b/packages/remark-lint-no-shell-dollars/index.js
index 105fbe31..df6bd1db 100644
--- a/packages/remark-lint-no-shell-dollars/index.js
+++ b/packages/remark-lint-no-shell-dollars/index.js
@@ -56,12 +56,33 @@
  *   5:1-8:4: Do not use dollar signs before shell commands
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
 
+// List of shell script file extensions (also used as code flags for syntax
+// highlighting on GitHub):
+// See: <https://github.com/github/linguist/blob/40992ba/lib/linguist/languages.yml#L4984>
+const flags = new Set([
+  'sh',
+  'bash',
+  'bats',
+  'cgi',
+  'command',
+  'fcgi',
+  'ksh',
+  'tmux',
+  'tool',
+  'zsh'
+])
+
 const remarkLintNoShellDollars = lintRule(
   'remark-lint:no-shell-dollars',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'code', (node) => {
       // Check both known shell code and unknown code.
@@ -90,19 +111,3 @@ const remarkLintNoShellDollars = lintRule(
 )
 
 export default remarkLintNoShellDollars
-
-// List of shell script file extensions (also used as code flags for syntax
-// highlighting on GitHub):
-// See: <https://github.com/github/linguist/blob/40992ba/lib/linguist/languages.yml#L4984>
-const flags = new Set([
-  'sh',
-  'bash',
-  'bats',
-  'cgi',
-  'command',
-  'fcgi',
-  'ksh',
-  'tmux',
-  'tool',
-  'zsh'
-])
diff --git a/packages/remark-lint-no-shell-dollars/package.json b/packages/remark-lint-no-shell-dollars/package.json
index 1a40e353..dd6917ad 100644
--- a/packages/remark-lint-no-shell-dollars/package.json
+++ b/packages/remark-lint-no-shell-dollars/package.json
@@ -24,13 +24,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-shell-dollars/readme.md b/packages/remark-lint-no-shell-dollars/readme.md
index 7f77f135..4b9217ee 100644
--- a/packages/remark-lint-no-shell-dollars/readme.md
+++ b/packages/remark-lint-no-shell-dollars/readme.md
@@ -84,12 +84,18 @@ $ echo a > file
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-shell-dollars
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoShellDollars`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -170,6 +176,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-shell-dollars/tsconfig.json b/packages/remark-lint-no-shell-dollars/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-shell-dollars/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-shortcut-reference-image/index.js b/packages/remark-lint-no-shortcut-reference-image/index.js
index 263d1304..696d1c22 100644
--- a/packages/remark-lint-no-shortcut-reference-image/index.js
+++ b/packages/remark-lint-no-shortcut-reference-image/index.js
@@ -32,12 +32,17 @@
  *   1:1-1:7: Use the trailing [] on reference images
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
 
 const remarkLintNoShortcutReferenceImage = lintRule(
   'remark-lint:no-shortcut-reference-image',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'imageReference', (node) => {
       if (!generated(node) && node.referenceType === 'shortcut') {
diff --git a/packages/remark-lint-no-shortcut-reference-image/package.json b/packages/remark-lint-no-shortcut-reference-image/package.json
index 102a36d3..a875730e 100644
--- a/packages/remark-lint-no-shortcut-reference-image/package.json
+++ b/packages/remark-lint-no-shortcut-reference-image/package.json
@@ -25,13 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-shortcut-reference-image/readme.md b/packages/remark-lint-no-shortcut-reference-image/readme.md
index 2927ec85..97dda604 100644
--- a/packages/remark-lint-no-shortcut-reference-image/readme.md
+++ b/packages/remark-lint-no-shortcut-reference-image/readme.md
@@ -61,12 +61,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-shortcut-reference-image
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoShortcutReferenceImage`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -147,6 +153,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-shortcut-reference-image/tsconfig.json b/packages/remark-lint-no-shortcut-reference-image/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-shortcut-reference-image/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-shortcut-reference-link/index.js b/packages/remark-lint-no-shortcut-reference-link/index.js
index aa9f8ba9..eadef1d3 100644
--- a/packages/remark-lint-no-shortcut-reference-link/index.js
+++ b/packages/remark-lint-no-shortcut-reference-link/index.js
@@ -32,12 +32,17 @@
  *   1:1-1:6: Use the trailing `[]` on reference links
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
 
 const remarkLintNoShortcutReferenceLink = lintRule(
   'remark-lint:no-shortcut-reference-link',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'linkReference', (node) => {
       if (!generated(node) && node.referenceType === 'shortcut') {
diff --git a/packages/remark-lint-no-shortcut-reference-link/package.json b/packages/remark-lint-no-shortcut-reference-link/package.json
index d711f73d..643113fc 100644
--- a/packages/remark-lint-no-shortcut-reference-link/package.json
+++ b/packages/remark-lint-no-shortcut-reference-link/package.json
@@ -25,13 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-shortcut-reference-link/readme.md b/packages/remark-lint-no-shortcut-reference-link/readme.md
index b6afc94d..93ddaaaf 100644
--- a/packages/remark-lint-no-shortcut-reference-link/readme.md
+++ b/packages/remark-lint-no-shortcut-reference-link/readme.md
@@ -61,12 +61,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-shortcut-reference-link
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoShortcutReferenceLink`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -147,6 +153,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-shortcut-reference-link/tsconfig.json b/packages/remark-lint-no-shortcut-reference-link/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-shortcut-reference-link/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-table-indentation/index.js b/packages/remark-lint-no-table-indentation/index.js
index edc046a4..28fce7d1 100644
--- a/packages/remark-lint-no-table-indentation/index.js
+++ b/packages/remark-lint-no-table-indentation/index.js
@@ -64,6 +64,10 @@
  *   3:6: Do not indent table rows
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit, SKIP} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
@@ -71,6 +75,7 @@ import {location} from 'vfile-location'
 
 const remarkLintNoTableIndentation = lintRule(
   'remark-lint:no-table-indentation',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
     const loc = location(value)
diff --git a/packages/remark-lint-no-table-indentation/package.json b/packages/remark-lint-no-table-indentation/package.json
index fc6dcc84..ba707350 100644
--- a/packages/remark-lint-no-table-indentation/package.json
+++ b/packages/remark-lint-no-table-indentation/package.json
@@ -24,14 +24,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0",
     "vfile-location": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-table-indentation/readme.md b/packages/remark-lint-no-table-indentation/readme.md
index 88537e7a..56319838 100644
--- a/packages/remark-lint-no-table-indentation/readme.md
+++ b/packages/remark-lint-no-table-indentation/readme.md
@@ -114,12 +114,18 @@ Note: `·` represents a space.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-table-indentation
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoTableIndentation`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -200,6 +206,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-table-indentation/tsconfig.json b/packages/remark-lint-no-table-indentation/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-table-indentation/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-tabs/index.js b/packages/remark-lint-no-tabs/index.js
index 149495a4..6af57d25 100644
--- a/packages/remark-lint-no-tabs/index.js
+++ b/packages/remark-lint-no-tabs/index.js
@@ -53,18 +53,26 @@
  *   13:41: Use spaces instead of tabs
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {location} from 'vfile-location'
 
-const remarkLintNoTabs = lintRule('remark-lint:no-tabs', (tree, file) => {
-  const value = String(file)
-  const toPoint = location(file).toPoint
-  let index = value.indexOf('\t')
+const remarkLintNoTabs = lintRule(
+  'remark-lint:no-tabs',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
+  (_, file) => {
+    const value = String(file)
+    const toPoint = location(file).toPoint
+    let index = value.indexOf('\t')
 
-  while (index !== -1) {
-    file.message('Use spaces instead of tabs', toPoint(index))
-    index = value.indexOf('\t', index + 1)
+    while (index !== -1) {
+      file.message('Use spaces instead of tabs', toPoint(index))
+      index = value.indexOf('\t', index + 1)
+    }
   }
-})
+)
 
 export default remarkLintNoTabs
diff --git a/packages/remark-lint-no-tabs/package.json b/packages/remark-lint-no-tabs/package.json
index 0c17ad80..004a2a9d 100644
--- a/packages/remark-lint-no-tabs/package.json
+++ b/packages/remark-lint-no-tabs/package.json
@@ -23,12 +23,25 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "vfile-location": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-tabs/readme.md b/packages/remark-lint-no-tabs/readme.md
index 13170e37..fd8b57a5 100644
--- a/packages/remark-lint-no-tabs/readme.md
+++ b/packages/remark-lint-no-tabs/readme.md
@@ -81,12 +81,18 @@ And this is a tab as the last character.»
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-tabs
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoTabs`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -167,6 +173,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-tabs/tsconfig.json b/packages/remark-lint-no-tabs/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-tabs/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-undefined-references/index.js b/packages/remark-lint-no-undefined-references/index.js
index 4f8cde54..d95fdff6 100644
--- a/packages/remark-lint-no-undefined-references/index.js
+++ b/packages/remark-lint-no-undefined-references/index.js
@@ -66,6 +66,17 @@
  *   17:23-17:26: Found reference to undefined definition
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').Heading} Heading
+ * @typedef {import('mdast').Paragraph} Paragraph
+ *
+ * @typedef Options
+ * @property {string[]} [allow]
+ *
+ * @typedef {number[]} Range
+ */
+
 import {normalizeIdentifier} from 'micromark-util-normalize-identifier'
 import {location} from 'vfile-location'
 import {lintRule} from 'unified-lint-rule'
@@ -75,6 +86,7 @@ import {visit, SKIP, EXIT} from 'unist-util-visit'
 
 const remarkLintNoUndefinedReferences = lintRule(
   'remark-lint:no-undefined-references',
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
   (tree, file, option = {}) => {
     const contents = String(file)
     const loc = location(file)
@@ -82,7 +94,8 @@ const remarkLintNoUndefinedReferences = lintRule(
     const allow = new Set(
       (option.allow || []).map((d) => normalizeIdentifier(d))
     )
-    const map = {}
+    /** @type {Record<string, boolean>} */
+    const map = Object.create(null)
 
     visit(tree, (node) => {
       if (
@@ -113,7 +126,11 @@ const remarkLintNoUndefinedReferences = lintRule(
       }
     })
 
+    /**
+     * @param {Heading|Paragraph} node
+     */
     function findInPhrasing(node) {
+      /** @type {Range[]} */
       let ranges = []
 
       visit(node, (child) => {
@@ -133,9 +150,12 @@ const remarkLintNoUndefinedReferences = lintRule(
         const end = pointEnd(child).offset
 
         // Bail if there’s no positional info.
-        if (!end) return EXIT
+        if (typeof start !== 'number' || typeof end !== 'number') {
+          return EXIT
+        }
 
         const source = contents.slice(start, end)
+        /** @type {Array.<[number, string]>} */
         const lines = [[start, '']]
         let last = 0
 
@@ -184,25 +204,35 @@ const remarkLintNoUndefinedReferences = lintRule(
 
                 // Collapsed or full.
                 let range = ranges.pop()
-                range.push(lines[lineIndex][0] + index)
 
-                // This is the end of a reference already.
+                // Range should always exist.
                 // eslint-disable-next-line max-depth
-                if (range.length === 4) {
-                  handleRange(range)
-                  range = []
-                }
+                if (range) {
+                  range.push(lines[lineIndex][0] + index)
 
-                range.push(lines[lineIndex][0] + index)
-                ranges.push(range)
-                index++
+                  // This is the end of a reference already.
+                  // eslint-disable-next-line max-depth
+                  if (range.length === 4) {
+                    handleRange(range)
+                    range = []
+                  }
+
+                  range.push(lines[lineIndex][0] + index)
+                  ranges.push(range)
+                  index++
+                }
               } else {
                 index++
 
                 // Shortcut or typical end of a reference.
                 const range = ranges.pop()
-                range.push(lines[lineIndex][0] + index)
-                handleRange(range)
+
+                // Range should always exist.
+                // eslint-disable-next-line max-depth
+                if (range) {
+                  range.push(lines[lineIndex][0] + index)
+                  handleRange(range)
+                }
               }
             }
             // Anything else.
@@ -221,6 +251,9 @@ const remarkLintNoUndefinedReferences = lintRule(
 
       return SKIP
 
+      /**
+       * @param {Range} range
+       */
       function handleRange(range) {
         if (range.length === 1) return
         if (range.length === 3) range.length = 2
diff --git a/packages/remark-lint-no-undefined-references/package.json b/packages/remark-lint-no-undefined-references/package.json
index dc0cd3bc..24660d15 100644
--- a/packages/remark-lint-no-undefined-references/package.json
+++ b/packages/remark-lint-no-undefined-references/package.json
@@ -24,16 +24,29 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "micromark-util-normalize-identifier": "^1.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0",
     "vfile-location": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-undefined-references/readme.md b/packages/remark-lint-no-undefined-references/readme.md
index e181cb11..bec36f4a 100644
--- a/packages/remark-lint-no-undefined-references/readme.md
+++ b/packages/remark-lint-no-undefined-references/readme.md
@@ -103,12 +103,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-undefined-references
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoUndefinedReferences`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -189,6 +195,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-undefined-references/tsconfig.json b/packages/remark-lint-no-undefined-references/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-undefined-references/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-unneeded-full-reference-image/index.js b/packages/remark-lint-no-unneeded-full-reference-image/index.js
index cd2a0150..74488b1f 100644
--- a/packages/remark-lint-no-unneeded-full-reference-image/index.js
+++ b/packages/remark-lint-no-unneeded-full-reference-image/index.js
@@ -40,6 +40,11 @@
  *   3:1-3:20: Remove the image label as it matches the reference text
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'-'|'*'|'+'} Marker
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
@@ -47,12 +52,15 @@ import {normalizeIdentifier} from 'micromark-util-normalize-identifier'
 
 const remarkLintNoUnneededFullReferenceImage = lintRule(
   'remark-lint:no-unneeded-full-reference-image',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'imageReference', (node) => {
       if (
         generated(node) ||
         node.referenceType !== 'full' ||
-        normalizeIdentifier(node.alt) !== node.identifier.toUpperCase()
+        // To do: update types to force `alt` existing.
+        /* c8 ignore next */
+        normalizeIdentifier(node.alt || '') !== node.identifier.toUpperCase()
       ) {
         return
       }
diff --git a/packages/remark-lint-no-unneeded-full-reference-image/package.json b/packages/remark-lint-no-unneeded-full-reference-image/package.json
index 8c837677..365703f6 100644
--- a/packages/remark-lint-no-unneeded-full-reference-image/package.json
+++ b/packages/remark-lint-no-unneeded-full-reference-image/package.json
@@ -26,14 +26,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "micromark-util-normalize-identifier": "^1.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-unneeded-full-reference-image/readme.md b/packages/remark-lint-no-unneeded-full-reference-image/readme.md
index bd810cab..ed5dc2c7 100644
--- a/packages/remark-lint-no-unneeded-full-reference-image/readme.md
+++ b/packages/remark-lint-no-unneeded-full-reference-image/readme.md
@@ -64,12 +64,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-unneeded-full-reference-image
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoUnneededFullReferenceImage`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -150,6 +156,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-unneeded-full-reference-image/tsconfig.json b/packages/remark-lint-no-unneeded-full-reference-image/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-unneeded-full-reference-image/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-unneeded-full-reference-link/index.js b/packages/remark-lint-no-unneeded-full-reference-link/index.js
index 4d3e2a86..2320cf44 100644
--- a/packages/remark-lint-no-unneeded-full-reference-link/index.js
+++ b/packages/remark-lint-no-unneeded-full-reference-link/index.js
@@ -46,6 +46,10 @@
  *   3:1-3:19: Remove the link label as it matches the reference text
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {generated} from 'unist-util-generated'
@@ -53,6 +57,7 @@ import {normalizeIdentifier} from 'micromark-util-normalize-identifier'
 
 const remarkLintNoUnneededFullReferenceLink = lintRule(
   'remark-lint:no-unneeded-full-reference-link',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     visit(tree, 'linkReference', (node) => {
       if (
diff --git a/packages/remark-lint-no-unneeded-full-reference-link/package.json b/packages/remark-lint-no-unneeded-full-reference-link/package.json
index fedeced4..9d8af3e9 100644
--- a/packages/remark-lint-no-unneeded-full-reference-link/package.json
+++ b/packages/remark-lint-no-unneeded-full-reference-link/package.json
@@ -26,14 +26,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "micromark-util-normalize-identifier": "^1.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-unneeded-full-reference-link/readme.md b/packages/remark-lint-no-unneeded-full-reference-link/readme.md
index e888f1e7..88ab9733 100644
--- a/packages/remark-lint-no-unneeded-full-reference-link/readme.md
+++ b/packages/remark-lint-no-unneeded-full-reference-link/readme.md
@@ -70,12 +70,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-unneeded-full-reference-link
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoUnneededFullReferenceLink`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -156,6 +162,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-unneeded-full-reference-link/tsconfig.json b/packages/remark-lint-no-unneeded-full-reference-link/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-unneeded-full-reference-link/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-no-unused-definitions/index.js b/packages/remark-lint-no-unused-definitions/index.js
index e11f9ad7..15a4178b 100644
--- a/packages/remark-lint-no-unused-definitions/index.js
+++ b/packages/remark-lint-no-unused-definitions/index.js
@@ -24,6 +24,11 @@
  *   1:1-1:27: Found unused definition
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').DefinitionContent} DefinitionContent
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {generated} from 'unist-util-generated'
 import {visit} from 'unist-util-visit'
@@ -32,7 +37,9 @@ const own = {}.hasOwnProperty
 
 const remarkLintNoUnusedDefinitions = lintRule(
   'remark-lint:no-unused-definitions',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
+    /** @type {Record<string, {node: DefinitionContent, used: boolean}>} */
     const map = Object.create(null)
 
     visit(tree, (node) => {
@@ -58,6 +65,7 @@ const remarkLintNoUnusedDefinitions = lintRule(
       }
     })
 
+    /** @type {string} */
     let identifier
 
     for (identifier in map) {
diff --git a/packages/remark-lint-no-unused-definitions/package.json b/packages/remark-lint-no-unused-definitions/package.json
index 2f1ce936..91428dd3 100644
--- a/packages/remark-lint-no-unused-definitions/package.json
+++ b/packages/remark-lint-no-unused-definitions/package.json
@@ -23,13 +23,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-no-unused-definitions/readme.md b/packages/remark-lint-no-unused-definitions/readme.md
index 5b5f9a8c..907a0ca4 100644
--- a/packages/remark-lint-no-unused-definitions/readme.md
+++ b/packages/remark-lint-no-unused-definitions/readme.md
@@ -52,12 +52,18 @@ No messages.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-no-unused-definitions
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintNoUnusedDefinitions`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -138,6 +144,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-no-unused-definitions/tsconfig.json b/packages/remark-lint-no-unused-definitions/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-no-unused-definitions/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-ordered-list-marker-style/index.js b/packages/remark-lint-ordered-list-marker-style/index.js
index 3c398915..a212f1e1 100644
--- a/packages/remark-lint-ordered-list-marker-style/index.js
+++ b/packages/remark-lint-ordered-list-marker-style/index.js
@@ -55,28 +55,27 @@
  *   1:1: Incorrect ordered list item marker style `💩`: use either `'.'` or `')'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'.'|')'} Marker
+ * @typedef {'consistent'|Marker} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
 import {generated} from 'unist-util-generated'
 
-const styles = {
-  ')': true,
-  '.': true,
-  null: true
-}
-
 const remarkLintOrderedListMarkerStyle = lintRule(
   'remark-lint:ordered-list-marker-style',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
     const value = String(file)
-    let preferred =
-      typeof option !== 'string' || option === 'consistent' ? null : option
 
-    if (styles[preferred] !== true) {
+    if (option !== 'consistent' && option !== '.' && option !== ')') {
       file.fail(
         'Incorrect ordered list item marker style `' +
-          preferred +
+          option +
           "`: use either `'.'` or `')'`"
       )
     }
@@ -90,20 +89,20 @@ const remarkLintOrderedListMarkerStyle = lintRule(
         const child = node.children[index]
 
         if (!generated(child)) {
-          const marker = value
-            .slice(
-              pointStart(child).offset,
-              pointStart(child.children[0]).offset
-            )
-            .replace(/\s|\d/g, '')
-            .replace(/\[[x ]?]\s*$/i, '')
+          const marker = /** @type {Marker} */ (
+            value
+              .slice(
+                pointStart(child).offset,
+                pointStart(child.children[0]).offset
+              )
+              .replace(/\s|\d/g, '')
+              .replace(/\[[x ]?]\s*$/i, '')
+          )
 
-          if (preferred) {
-            if (marker !== preferred) {
-              file.message('Marker style should be `' + preferred + '`', child)
-            }
-          } else {
-            preferred = marker
+          if (option === 'consistent') {
+            option = marker
+          } else if (marker !== option) {
+            file.message('Marker style should be `' + option + '`', child)
           }
         }
       }
diff --git a/packages/remark-lint-ordered-list-marker-style/package.json b/packages/remark-lint-ordered-list-marker-style/package.json
index 5a5d5eb5..29f3ecf1 100644
--- a/packages/remark-lint-ordered-list-marker-style/package.json
+++ b/packages/remark-lint-ordered-list-marker-style/package.json
@@ -25,14 +25,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-ordered-list-marker-style/readme.md b/packages/remark-lint-ordered-list-marker-style/readme.md
index 355c7281..1c059191 100644
--- a/packages/remark-lint-ordered-list-marker-style/readme.md
+++ b/packages/remark-lint-ordered-list-marker-style/readme.md
@@ -108,12 +108,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-ordered-list-marker-style
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintOrderedListMarkerStyle`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -194,6 +200,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-ordered-list-marker-style/tsconfig.json b/packages/remark-lint-ordered-list-marker-style/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-ordered-list-marker-style/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-ordered-list-marker-value/index.js b/packages/remark-lint-ordered-list-marker-value/index.js
index db00c0d3..999e5a4f 100644
--- a/packages/remark-lint-ordered-list-marker-value/index.js
+++ b/packages/remark-lint-ordered-list-marker-value/index.js
@@ -134,7 +134,12 @@
  * @example
  *   {"name": "not-ok.md", "setting": "💩", "label": "output", "positionless": true}
  *
- *   1:1: Incorrect ordered list item marker value `💩`: use either `'ordered'` or `'one'`
+ *   1:1: Incorrect ordered list item marker value `💩`: use either `'ordered'`, `'one'`, or `'single'`
+ */
+
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'single'|'one'|'ordered'} Options
  */
 
 import {lintRule} from 'unified-lint-rule'
@@ -142,19 +147,17 @@ import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
 import {generated} from 'unist-util-generated'
 
-const styles = {ordered: true, single: true, one: true}
-
 const remarkLintOrderedListMarkerValue = lintRule(
   'remark-lint:ordered-list-marker-value',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'ordered') => {
     const value = String(file)
-    const preferred = typeof option === 'string' ? option : 'ordered'
 
-    if (styles[preferred] !== true) {
+    if (option !== 'ordered' && option !== 'one' && option !== 'single') {
       file.fail(
         'Incorrect ordered list item marker value `' +
-          preferred +
-          "`: use either `'ordered'` or `'one'`"
+          option +
+          "`: use either `'ordered'`, `'one'`, or `'single'`"
       )
     }
 
@@ -162,7 +165,7 @@ const remarkLintOrderedListMarkerValue = lintRule(
       if (!node.ordered) return
 
       let expected =
-        preferred === 'one' || node.start === null || node.start === undefined
+        option === 'one' || node.start === null || node.start === undefined
           ? 1
           : node.start
       let index = -1
@@ -171,12 +174,12 @@ const remarkLintOrderedListMarkerValue = lintRule(
         const child = node.children[index]
 
         // Ignore generated nodes, first items.
-        if (generated(child) || (index === 0 && preferred !== 'one')) {
+        if (generated(child) || (index === 0 && option !== 'one')) {
           continue
         }
 
         // Increase the expected line number when in `ordered` mode.
-        if (preferred === 'ordered') {
+        if (option === 'ordered') {
           expected++
         }
 
diff --git a/packages/remark-lint-ordered-list-marker-value/package.json b/packages/remark-lint-ordered-list-marker-value/package.json
index 41c15120..01ed6df4 100644
--- a/packages/remark-lint-ordered-list-marker-value/package.json
+++ b/packages/remark-lint-ordered-list-marker-value/package.json
@@ -25,14 +25,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-ordered-list-marker-value/readme.md b/packages/remark-lint-ordered-list-marker-value/readme.md
index d76e03f5..bdb15946 100644
--- a/packages/remark-lint-ordered-list-marker-value/readme.md
+++ b/packages/remark-lint-ordered-list-marker-value/readme.md
@@ -206,17 +206,23 @@ When configured with `'💩'`.
 ###### Out
 
 ```text
-1:1: Incorrect ordered list item marker value `💩`: use either `'ordered'` or `'one'`
+1:1: Incorrect ordered list item marker value `💩`: use either `'ordered'`, `'one'`, or `'single'`
 ```
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-ordered-list-marker-value
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintOrderedListMarkerValue`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -297,6 +303,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-ordered-list-marker-value/tsconfig.json b/packages/remark-lint-ordered-list-marker-value/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-ordered-list-marker-value/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-rule-style/index.js b/packages/remark-lint-rule-style/index.js
index bd050aa9..e7894a6c 100644
--- a/packages/remark-lint-rule-style/index.js
+++ b/packages/remark-lint-rule-style/index.js
@@ -60,19 +60,22 @@
  *   1:1: Incorrect preferred rule style: provide a correct markdown rule or `'consistent'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {string} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
 
 const remarkLintRuleStyle = lintRule(
   'remark-lint:rule-style',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
     const value = String(file)
-    let preferred =
-      typeof option === 'string' && option !== 'consistent' ? option : null
 
-    if (preferred !== null && /[^-_* ]/.test(preferred)) {
+    if (option !== 'consistent' && /[^-_* ]/.test(option)) {
       file.fail(
         "Incorrect preferred rule style: provide a correct markdown rule or `'consistent'`"
       )
@@ -82,15 +85,13 @@ const remarkLintRuleStyle = lintRule(
       const initial = pointStart(node).offset
       const final = pointEnd(node).offset
 
-      if (!generated(node)) {
+      if (typeof initial === 'number' && typeof final === 'number') {
         const rule = value.slice(initial, final)
 
-        if (preferred) {
-          if (rule !== preferred) {
-            file.message('Rules should use `' + preferred + '`', node)
-          }
-        } else {
-          preferred = rule
+        if (option === 'consistent') {
+          option = rule
+        } else if (rule !== option) {
+          file.message('Rules should use `' + option + '`', node)
         }
       }
     })
diff --git a/packages/remark-lint-rule-style/package.json b/packages/remark-lint-rule-style/package.json
index 9701119f..119273f8 100644
--- a/packages/remark-lint-rule-style/package.json
+++ b/packages/remark-lint-rule-style/package.json
@@ -25,14 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-rule-style/readme.md b/packages/remark-lint-rule-style/readme.md
index 43a37599..f37fcbc3 100644
--- a/packages/remark-lint-rule-style/readme.md
+++ b/packages/remark-lint-rule-style/readme.md
@@ -105,12 +105,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-rule-style
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintRuleStyle`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -191,6 +197,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-rule-style/tsconfig.json b/packages/remark-lint-rule-style/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-rule-style/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-strikethrough-marker/index.js b/packages/remark-lint-strikethrough-marker/index.js
index d78e6f2d..35d8093e 100644
--- a/packages/remark-lint-strikethrough-marker/index.js
+++ b/packages/remark-lint-strikethrough-marker/index.js
@@ -63,43 +63,44 @@
  *   1:1: Incorrect strikethrough marker `💩`: use either `'consistent'`, `'~'`, or `'~~'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'~'|'~~'} Marker
+ * @typedef {'consistent'|Marker} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
-
-const markers = {null: true, '~': true, '~~': true}
 
 const remarkLintStrikethroughMarker = lintRule(
   'remark-lint:strikethrough-marker',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
     const value = String(file)
-    let preferred =
-      typeof option === 'string' && option !== 'consistent' ? option : null
 
-    if (markers[preferred] !== true) {
+    if (option !== '~' && option !== '~~' && option !== 'consistent') {
       file.fail(
         'Incorrect strikethrough marker `' +
-          preferred +
+          option +
           "`: use either `'consistent'`, `'~'`, or `'~~'`"
       )
     }
 
     visit(tree, 'delete', (node) => {
-      if (!generated(node)) {
-        const offset = pointStart(node).offset
-        const both = value.slice(offset, offset + 2)
+      const start = pointStart(node).offset
+
+      if (typeof start === 'number') {
+        const both = value.slice(start, start + 2)
         const marker = both === '~~' ? '~~' : '~'
 
-        if (preferred) {
-          if (marker !== preferred) {
-            file.message(
-              'Strikethrough should use `' + preferred + '` as a marker',
-              node
-            )
-          }
-        } else {
-          preferred = marker
+        if (option === 'consistent') {
+          option = marker
+        } else if (marker !== option) {
+          file.message(
+            'Strikethrough should use `' + option + '` as a marker',
+            node
+          )
         }
       }
     })
diff --git a/packages/remark-lint-strikethrough-marker/package.json b/packages/remark-lint-strikethrough-marker/package.json
index d6ef0534..9cffe92d 100644
--- a/packages/remark-lint-strikethrough-marker/package.json
+++ b/packages/remark-lint-strikethrough-marker/package.json
@@ -25,14 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-strikethrough-marker/readme.md b/packages/remark-lint-strikethrough-marker/readme.md
index ea2aa9a4..c8b6789e 100644
--- a/packages/remark-lint-strikethrough-marker/readme.md
+++ b/packages/remark-lint-strikethrough-marker/readme.md
@@ -125,12 +125,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-strikethrough-marker
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintStrikethroughMarker`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -211,6 +217,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-strikethrough-marker/tsconfig.json b/packages/remark-lint-strikethrough-marker/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-strikethrough-marker/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-strong-marker/index.js b/packages/remark-lint-strong-marker/index.js
index 6c35ced9..1a574e38 100644
--- a/packages/remark-lint-strong-marker/index.js
+++ b/packages/remark-lint-strong-marker/index.js
@@ -58,41 +58,40 @@
  *   1:1: Incorrect strong marker `💩`: use either `'consistent'`, `'*'`, or `'_'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'*'|'_'} Marker
+ * @typedef {'consistent'|Marker} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
-
-const markers = {'*': true, _: true, null: true}
 
 const remarkLintStrongMarker = lintRule(
   'remark-lint:strong-marker',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
     const value = String(file)
-    let preferred =
-      typeof option === 'string' && option !== 'consistent' ? option : null
 
-    if (markers[preferred] !== true) {
+    if (option !== '*' && option !== '_' && option !== 'consistent') {
       file.fail(
         'Incorrect strong marker `' +
-          preferred +
+          option +
           "`: use either `'consistent'`, `'*'`, or `'_'`"
       )
     }
 
     visit(tree, 'strong', (node) => {
-      const marker = value.charAt(pointStart(node).offset)
+      const start = pointStart(node).offset
+
+      if (typeof start === 'number') {
+        const marker = /** @type {Marker} */ (value.charAt(start))
 
-      if (!generated(node)) {
-        if (preferred) {
-          if (marker !== preferred) {
-            file.message(
-              'Strong should use `' + preferred + '` as a marker',
-              node
-            )
-          }
-        } else {
-          preferred = marker
+        if (option === 'consistent') {
+          option = marker
+        } else if (marker !== option) {
+          file.message('Strong should use `' + option + '` as a marker', node)
         }
       }
     })
diff --git a/packages/remark-lint-strong-marker/package.json b/packages/remark-lint-strong-marker/package.json
index d67a9ecf..cbd83729 100644
--- a/packages/remark-lint-strong-marker/package.json
+++ b/packages/remark-lint-strong-marker/package.json
@@ -25,14 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-strong-marker/readme.md b/packages/remark-lint-strong-marker/readme.md
index 52abcbb4..11cc2260 100644
--- a/packages/remark-lint-strong-marker/readme.md
+++ b/packages/remark-lint-strong-marker/readme.md
@@ -117,12 +117,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-strong-marker
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintStrongMarker`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -203,6 +209,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-strong-marker/tsconfig.json b/packages/remark-lint-strong-marker/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-strong-marker/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-table-cell-padding/index.js b/packages/remark-lint-table-cell-padding/index.js
index bcffc7db..871939fa 100644
--- a/packages/remark-lint-table-cell-padding/index.js
+++ b/packages/remark-lint-table-cell-padding/index.js
@@ -170,35 +170,51 @@
  *   | Echo  | Foxtrot |
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').TableCell} TableCell
+ * @typedef {import('unist').Point} Point
+ * @typedef {'padded'|'compact'} Style
+ * @typedef {'consistent'|Style} Options
+ *
+ * @typedef Entry
+ * @property {TableCell} node
+ * @property {number} start
+ * @property {number} end
+ * @property {number} column
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit, SKIP} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
-
-const styles = {null: true, padded: true, compact: true}
 
 const remarkLintTableCellPadding = lintRule(
   'remark-lint:table-cell-padding',
-  (tree, file, option) => {
-    const preferred =
-      typeof option === 'string' && option !== 'consistent' ? option : null
-
-    if (styles[preferred] !== true) {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
+    if (
+      option !== 'padded' &&
+      option !== 'compact' &&
+      option !== 'consistent'
+    ) {
       file.fail(
         'Incorrect table cell padding style `' +
-          preferred +
+          option +
           "`, expected `'padded'`, `'compact'`, or `'consistent'`"
       )
     }
 
     visit(tree, 'table', (node) => {
       const rows = node.children
-      const sizes = Array.from({length: node.align.length})
+      // To do: fix types to always have `align` defined.
+      /* c8 ignore next */
+      const align = node.align || []
+      /** @type {number[]} */
+      const sizes = Array.from({length: align.length})
+      /** @type {Entry[]} */
       const entries = []
       let index = -1
 
-      if (generated(node)) return
-
       // Check rows.
       while (++index < rows.length) {
         const row = rows[index]
@@ -208,16 +224,27 @@ const remarkLintTableCellPadding = lintRule(
         while (++column < row.children.length) {
           const cell = row.children[column]
 
-          if (cell && cell.children.length > 0) {
+          if (cell.children.length > 0) {
+            const cellStart = pointStart(cell).offset
+            const cellEnd = pointEnd(cell).offset
             const contentStart = pointStart(cell.children[0]).offset
             const contentEnd = pointEnd(
               cell.children[cell.children.length - 1]
             ).offset
 
+            if (
+              typeof cellStart !== 'number' ||
+              typeof cellEnd !== 'number' ||
+              typeof contentStart !== 'number' ||
+              typeof contentEnd !== 'number'
+            ) {
+              continue
+            }
+
             entries.push({
               node: cell,
-              start: contentStart - pointStart(cell).offset - (column ? 0 : 1),
-              end: pointEnd(cell).offset - contentEnd - 1,
+              start: contentStart - cellStart - (column ? 0 : 1),
+              end: cellEnd - contentEnd - 1,
               column
             })
 
@@ -230,13 +257,14 @@ const remarkLintTableCellPadding = lintRule(
         }
       }
 
-      const style = preferred
-        ? preferred === 'padded'
+      const style =
+        option === 'consistent'
+          ? entries[0] && (!entries[0].start || !entries[0].end)
+            ? 0
+            : 1
+          : option === 'padded'
           ? 1
           : 0
-        : entries[0] && (!entries[0].start || !entries[0].end)
-        ? 0
-        : 1
 
       index = -1
 
@@ -248,6 +276,12 @@ const remarkLintTableCellPadding = lintRule(
       return SKIP
     })
 
+    /**
+     * @param {'start'|'end'} side
+     * @param {Entry} entry
+     * @param {0|1} style
+     * @param {number[]} sizes
+     */
     function checkSide(side, entry, style, sizes) {
       const cell = entry.node
       const column = entry.column
@@ -279,18 +313,25 @@ const remarkLintTableCellPadding = lintRule(
         }
       }
 
+      /** @type {Point} */
       let point
 
       if (side === 'start') {
         point = pointStart(cell)
         if (!column) {
           point.column++
-          point.offset++
+
+          if (typeof point.offset === 'number') {
+            point.offset++
+          }
         }
       } else {
         point = pointEnd(cell)
         point.column--
-        point.offset--
+
+        if (typeof point.offset === 'number') {
+          point.offset--
+        }
       }
 
       file.message(reason, point)
@@ -300,9 +341,14 @@ const remarkLintTableCellPadding = lintRule(
 
 export default remarkLintTableCellPadding
 
+/**
+ * @param {TableCell} node
+ * @returns {number}
+ */
 function size(node) {
-  return (
-    pointEnd(node.children[node.children.length - 1]).offset -
-    pointStart(node.children[0]).offset
-  )
+  const head = pointStart(node.children[0]).offset
+  const tail = pointEnd(node.children[node.children.length - 1]).offset
+  // Only called when we’re sure offsets exist.
+  /* c8 ignore next */
+  return typeof head === 'number' && typeof tail === 'number' ? tail - head : 0
 }
diff --git a/packages/remark-lint-table-cell-padding/package.json b/packages/remark-lint-table-cell-padding/package.json
index ea56f6ba..82c4167d 100644
--- a/packages/remark-lint-table-cell-padding/package.json
+++ b/packages/remark-lint-table-cell-padding/package.json
@@ -25,14 +25,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/unist": "^2.0.0",
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-table-cell-padding/readme.md b/packages/remark-lint-table-cell-padding/readme.md
index af3d3c0d..e4ff95a0 100644
--- a/packages/remark-lint-table-cell-padding/readme.md
+++ b/packages/remark-lint-table-cell-padding/readme.md
@@ -288,12 +288,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-table-cell-padding
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintTableCellPadding`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -374,6 +380,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-table-cell-padding/tsconfig.json b/packages/remark-lint-table-cell-padding/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-table-cell-padding/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-table-pipe-alignment/index.js b/packages/remark-lint-table-pipe-alignment/index.js
index 164d3ac8..73dee33c 100644
--- a/packages/remark-lint-table-pipe-alignment/index.js
+++ b/packages/remark-lint-table-pipe-alignment/index.js
@@ -46,26 +46,27 @@
  *   3:17-3:18: Misaligned table fence
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'-'|'*'|'+'} Marker
+ * @typedef {'consistent'|Marker} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
-
-const reason = 'Misaligned table fence'
 
 const remarkLintTablePipeAlignment = lintRule(
   'remark-lint:table-pipe-alignment',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
 
     visit(tree, 'table', (node) => {
+      /** @type {number[]} */
       const indices = []
       let index = -1
 
-      if (generated(node)) {
-        return
-      }
-
       while (++index < node.children.length) {
         const row = node.children[index]
         const begin = pointStart(row)
@@ -77,16 +78,22 @@ const remarkLintTablePipeAlignment = lintRule(
           const next = row.children[nextColumn]
           const initial = cell ? pointEnd(cell).offset : pointStart(row).offset
           const final = next ? pointStart(next).offset : pointEnd(row).offset
-          const fence = value.slice(initial, final)
-          const pos = initial + fence.indexOf('|') - begin.offset + 1
 
           if (
-            indices[nextColumn] === undefined ||
-            indices[nextColumn] === null
+            typeof initial !== 'number' ||
+            typeof final !== 'number' ||
+            typeof begin.offset !== 'number'
           ) {
+            continue
+          }
+
+          const fence = value.slice(initial, final)
+          const pos = initial + fence.indexOf('|') - begin.offset + 1
+
+          if (indices[nextColumn] === undefined) {
             indices[nextColumn] = pos
           } else if (pos !== indices[nextColumn]) {
-            file.message(reason, {
+            file.message('Misaligned table fence', {
               start: {line: begin.line, column: pos},
               end: {line: begin.line, column: pos + 1}
             })
diff --git a/packages/remark-lint-table-pipe-alignment/package.json b/packages/remark-lint-table-pipe-alignment/package.json
index 3f1bbe03..34b38295 100644
--- a/packages/remark-lint-table-pipe-alignment/package.json
+++ b/packages/remark-lint-table-pipe-alignment/package.json
@@ -26,14 +26,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-table-pipe-alignment/readme.md b/packages/remark-lint-table-pipe-alignment/readme.md
index 08b9764b..b4646c7f 100644
--- a/packages/remark-lint-table-pipe-alignment/readme.md
+++ b/packages/remark-lint-table-pipe-alignment/readme.md
@@ -78,12 +78,18 @@ Note: this example uses [GFM][].
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-table-pipe-alignment
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintTablePipeAlignment`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -164,6 +170,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-table-pipe-alignment/tsconfig.json b/packages/remark-lint-table-pipe-alignment/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-table-pipe-alignment/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-table-pipes/index.js b/packages/remark-lint-table-pipes/index.js
index fd971bf3..0880433b 100644
--- a/packages/remark-lint-table-pipes/index.js
+++ b/packages/remark-lint-table-pipes/index.js
@@ -40,16 +40,20 @@
  *   3:14: Missing final pipe in table fence
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
-import {generated} from 'unist-util-generated'
 
 const reasonStart = 'Missing initial pipe in table fence'
 const reasonEnd = 'Missing final pipe in table fence'
 
 const remarkLintTablePipes = lintRule(
   'remark-lint:table-pipes',
+  /** @type {import('unified-lint-rule').Rule<Root, void>} */
   (tree, file) => {
     const value = String(file)
 
@@ -58,15 +62,21 @@ const remarkLintTablePipes = lintRule(
 
       while (++index < node.children.length) {
         const row = node.children[index]
+        const start = pointStart(row)
+        const end = pointEnd(row)
 
-        if (!generated(row)) {
-          if (value.charCodeAt(pointStart(row).offset) !== 124) {
-            file.message(reasonStart, pointStart(row))
-          }
+        if (
+          typeof start.offset === 'number' &&
+          value.charCodeAt(start.offset) !== 124
+        ) {
+          file.message(reasonStart, start)
+        }
 
-          if (value.charCodeAt(pointEnd(row).offset - 1) !== 124) {
-            file.message(reasonEnd, pointEnd(row))
-          }
+        if (
+          typeof end.offset === 'number' &&
+          value.charCodeAt(end.offset - 1) !== 124
+        ) {
+          file.message(reasonEnd, end)
         }
       }
     })
diff --git a/packages/remark-lint-table-pipes/package.json b/packages/remark-lint-table-pipes/package.json
index 5329b8d1..411b911c 100644
--- a/packages/remark-lint-table-pipes/package.json
+++ b/packages/remark-lint-table-pipes/package.json
@@ -25,14 +25,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
-    "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-table-pipes/readme.md b/packages/remark-lint-table-pipes/readme.md
index 6eb1e8f6..a3347df9 100644
--- a/packages/remark-lint-table-pipes/readme.md
+++ b/packages/remark-lint-table-pipes/readme.md
@@ -72,12 +72,18 @@ Alpha | Bravo
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-table-pipes
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintTablePipes`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -158,6 +164,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-table-pipes/tsconfig.json b/packages/remark-lint-table-pipes/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-table-pipes/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint-unordered-list-marker-style/index.js b/packages/remark-lint-unordered-list-marker-style/index.js
index d5e54f9f..710a5ae1 100644
--- a/packages/remark-lint-unordered-list-marker-style/index.js
+++ b/packages/remark-lint-unordered-list-marker-style/index.js
@@ -73,29 +73,29 @@
  *   1:1: Incorrect unordered list item marker style `💩`: use either `'-'`, `'*'`, or `'+'`
  */
 
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {'-'|'*'|'+'} Marker
+ * @typedef {'consistent'|Marker} Options
+ */
+
 import {lintRule} from 'unified-lint-rule'
 import {visit} from 'unist-util-visit'
 import {pointStart} from 'unist-util-position'
 import {generated} from 'unist-util-generated'
 
-const styles = {
-  '-': true,
-  '*': true,
-  '+': true,
-  undefined: true
-}
+const markers = new Set(['-', '*', '+'])
 
 const remarkLintUnorderedListMarkerStyle = lintRule(
   'remark-lint:unordered-list-marker-style',
-  (tree, file, option) => {
+  /** @type {import('unified-lint-rule').Rule<Root, Options>} */
+  (tree, file, option = 'consistent') => {
     const value = String(file)
-    let preferred =
-      typeof option === 'string' && option !== 'consistent' ? option : undefined
 
-    if (styles[preferred] !== true) {
+    if (option !== 'consistent' && !markers.has(option)) {
       file.fail(
         'Incorrect unordered list item marker style `' +
-          preferred +
+          option +
           "`: use either `'-'`, `'*'`, or `'+'`"
       )
     }
@@ -103,27 +103,26 @@ const remarkLintUnorderedListMarkerStyle = lintRule(
     visit(tree, 'list', (node) => {
       if (node.ordered) return
 
-      const children = node.children
       let index = -1
 
-      while (++index < children.length) {
-        const child = children[index]
+      while (++index < node.children.length) {
+        const child = node.children[index]
 
         if (!generated(child)) {
-          const marker = value
-            .slice(
-              pointStart(child).offset,
-              pointStart(child.children[0]).offset
-            )
-            .replace(/\[[x ]?]\s*$/i, '')
-            .replace(/\s/g, '')
+          const marker = /** @type {Marker} */ (
+            value
+              .slice(
+                pointStart(child).offset,
+                pointStart(child.children[0]).offset
+              )
+              .replace(/\[[x ]?]\s*$/i, '')
+              .replace(/\s/g, '')
+          )
 
-          if (preferred) {
-            if (marker !== preferred) {
-              file.message('Marker style should be `' + preferred + '`', child)
-            }
-          } else {
-            preferred = marker
+          if (option === 'consistent') {
+            option = marker
+          } else if (marker !== option) {
+            file.message('Marker style should be `' + option + '`', child)
           }
         }
       }
diff --git a/packages/remark-lint-unordered-list-marker-style/package.json b/packages/remark-lint-unordered-list-marker-style/package.json
index 4bcabd59..0003bb00 100644
--- a/packages/remark-lint-unordered-list-marker-style/package.json
+++ b/packages/remark-lint-unordered-list-marker-style/package.json
@@ -25,14 +25,27 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
+    "unified": "^10.0.0",
     "unified-lint-rule": "^1.0.0",
     "unist-util-generated": "^2.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^4.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint-unordered-list-marker-style/readme.md b/packages/remark-lint-unordered-list-marker-style/readme.md
index 92cd0c6b..a3d92d2c 100644
--- a/packages/remark-lint-unordered-list-marker-style/readme.md
+++ b/packages/remark-lint-unordered-list-marker-style/readme.md
@@ -133,12 +133,18 @@ When configured with `'💩'`.
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-lint-unordered-list-marker-style
 ```
 
+This package exports no identifiers.
+The default export is `remarkLintUnorderedListMarkerStyle`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -219,6 +225,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-lint-unordered-list-marker-style/tsconfig.json b/packages/remark-lint-unordered-list-marker-style/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint-unordered-list-marker-style/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-lint/index.js b/packages/remark-lint/index.js
index 22c15efd..8efa5dd8 100644
--- a/packages/remark-lint/index.js
+++ b/packages/remark-lint/index.js
@@ -1,12 +1,21 @@
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
 import remarkMessageControl from 'remark-message-control'
 
-// `remark-lint`.
-// This adds support for ignoring stuff from messages (`<!--lint ignore-->`).
-// All rules are in their own packages and presets.
+/**
+ * The core plugin for `remark-lint`.
+ * This adds support for ignoring stuff from messages (`<!--lint ignore-->`).
+ * All rules are in their own packages and presets.
+ *
+ * @type {import('unified').Plugin<void[], Root>}
+ */
 export default function remarkLint() {
   this.use(lintMessageControl)
 }
 
+/** @type {import('unified').Plugin<void[], Root>} */
 function lintMessageControl() {
   return remarkMessageControl({name: 'lint', source: 'remark-lint'})
 }
diff --git a/packages/remark-lint/package.json b/packages/remark-lint/package.json
index 8137c567..5dcdb6e9 100644
--- a/packages/remark-lint/package.json
+++ b/packages/remark-lint/package.json
@@ -26,11 +26,24 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
-    "remark-message-control": "^7.0.0"
+    "@types/mdast": "^3.0.0",
+    "remark-message-control": "^7.0.0",
+    "unified": "^10.1.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-lint/tsconfig.json b/packages/remark-lint/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-lint/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-preset-lint-consistent/package.json b/packages/remark-preset-lint-consistent/package.json
index 648bdbe2..579d9faa 100644
--- a/packages/remark-preset-lint-consistent/package.json
+++ b/packages/remark-preset-lint-consistent/package.json
@@ -23,10 +23,13 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "remark-lint": "^8.0.0",
     "remark-lint-blockquote-indentation": "^2.0.0",
     "remark-lint-checkbox-character-style": "^3.0.0",
@@ -39,7 +42,17 @@
     "remark-lint-ordered-list-marker-style": "^2.0.0",
     "remark-lint-rule-style": "^2.0.0",
     "remark-lint-strong-marker": "^2.0.0",
-    "remark-lint-table-cell-padding": "^3.0.0"
+    "remark-lint-table-cell-padding": "^3.0.0",
+    "unified": "^10.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-preset-lint-consistent/readme.md b/packages/remark-preset-lint-consistent/readme.md
index ca844d90..5870e331 100644
--- a/packages/remark-preset-lint-consistent/readme.md
+++ b/packages/remark-preset-lint-consistent/readme.md
@@ -34,12 +34,18 @@ This preset configures [`remark-lint`](https://github.com/remarkjs/remark-lint)
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-preset-lint-consistent
 ```
 
+This package exports no identifiers.
+The default export is `remarkPresetLintConsistent`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -113,6 +119,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-preset-lint-consistent/tsconfig.json b/packages/remark-preset-lint-consistent/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-preset-lint-consistent/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-preset-lint-markdown-style-guide/package.json b/packages/remark-preset-lint-markdown-style-guide/package.json
index 2086d7cb..166367dd 100644
--- a/packages/remark-preset-lint-markdown-style-guide/package.json
+++ b/packages/remark-preset-lint-markdown-style-guide/package.json
@@ -24,55 +24,68 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "remark-lint": "^8.0.0",
+    "remark-lint-blockquote-indentation": "^2.0.0",
+    "remark-lint-code-block-style": "^2.0.0",
+    "remark-lint-definition-case": "^2.0.0",
+    "remark-lint-definition-spacing": "^2.0.0",
+    "remark-lint-emphasis-marker": "^2.0.0",
+    "remark-lint-fenced-code-flag": "^2.0.0",
+    "remark-lint-fenced-code-marker": "^2.0.0",
     "remark-lint-file-extension": "^1.0.0",
-    "remark-lint-no-file-name-mixed-case": "^1.0.0",
-    "remark-lint-no-file-name-articles": "^1.0.0",
-    "remark-lint-no-file-name-irregular-characters": "^1.0.0",
-    "remark-lint-no-file-name-consecutive-dashes": "^1.0.0",
-    "remark-lint-no-file-name-outer-dashes": "^1.0.0",
-    "remark-lint-no-consecutive-blank-lines": "^3.0.0",
-    "remark-lint-maximum-line-length": "^2.0.0",
-    "remark-lint-no-shell-dollars": "^2.0.0",
+    "remark-lint-final-definition": "^2.0.0",
     "remark-lint-hard-break-spaces": "^2.0.0",
-    "remark-lint-heading-style": "^2.0.0",
     "remark-lint-heading-increment": "^2.0.0",
-    "remark-lint-no-duplicate-headings": "^2.0.0",
-    "remark-lint-no-multiple-toplevel-headings": "^2.0.0",
-    "remark-lint-maximum-heading-length": "^2.0.0",
-    "remark-lint-no-heading-punctuation": "^2.0.0",
-    "remark-lint-blockquote-indentation": "^2.0.0",
-    "remark-lint-no-blockquote-without-marker": "^4.0.0",
-    "remark-lint-unordered-list-marker-style": "^2.0.0",
-    "remark-lint-ordered-list-marker-style": "^2.0.0",
-    "remark-lint-ordered-list-marker-value": "^2.0.0",
-    "remark-lint-list-item-indent": "^2.0.0",
+    "remark-lint-heading-style": "^2.0.0",
+    "remark-lint-link-title-style": "^2.0.0",
     "remark-lint-list-item-content-indent": "^2.0.0",
+    "remark-lint-list-item-indent": "^2.0.0",
     "remark-lint-list-item-spacing": "^3.0.0",
-    "remark-lint-code-block-style": "^2.0.0",
-    "remark-lint-fenced-code-flag": "^2.0.0",
-    "remark-lint-fenced-code-marker": "^2.0.0",
-    "remark-lint-rule-style": "^2.0.0",
-    "remark-lint-no-table-indentation": "^3.0.0",
-    "remark-lint-table-pipes": "^3.0.0",
-    "remark-lint-table-pipe-alignment": "^2.0.0",
-    "remark-lint-table-cell-padding": "^3.0.0",
+    "remark-lint-maximum-heading-length": "^2.0.0",
+    "remark-lint-maximum-line-length": "^2.0.0",
+    "remark-lint-no-auto-link-without-protocol": "^2.0.0",
+    "remark-lint-no-blockquote-without-marker": "^4.0.0",
+    "remark-lint-no-consecutive-blank-lines": "^3.0.0",
+    "remark-lint-no-duplicate-headings": "^2.0.0",
+    "remark-lint-no-emphasis-as-heading": "^2.0.0",
+    "remark-lint-no-file-name-articles": "^1.0.0",
+    "remark-lint-no-file-name-consecutive-dashes": "^1.0.0",
+    "remark-lint-no-file-name-irregular-characters": "^1.0.0",
+    "remark-lint-no-file-name-mixed-case": "^1.0.0",
+    "remark-lint-no-file-name-outer-dashes": "^1.0.0",
+    "remark-lint-no-heading-punctuation": "^2.0.0",
     "remark-lint-no-inline-padding": "^3.0.0",
+    "remark-lint-no-literal-urls": "^2.0.0",
+    "remark-lint-no-multiple-toplevel-headings": "^2.0.0",
+    "remark-lint-no-shell-dollars": "^2.0.0",
     "remark-lint-no-shortcut-reference-image": "^2.0.0",
     "remark-lint-no-shortcut-reference-link": "^2.0.0",
-    "remark-lint-final-definition": "^2.0.0",
-    "remark-lint-definition-case": "^2.0.0",
-    "remark-lint-definition-spacing": "^2.0.0",
-    "remark-lint-link-title-style": "^2.0.0",
+    "remark-lint-no-table-indentation": "^3.0.0",
+    "remark-lint-ordered-list-marker-style": "^2.0.0",
+    "remark-lint-ordered-list-marker-value": "^2.0.0",
+    "remark-lint-rule-style": "^2.0.0",
     "remark-lint-strong-marker": "^2.0.0",
-    "remark-lint-emphasis-marker": "^2.0.0",
-    "remark-lint-no-emphasis-as-heading": "^2.0.0",
-    "remark-lint-no-literal-urls": "^2.0.0",
-    "remark-lint-no-auto-link-without-protocol": "^2.0.0"
+    "remark-lint-table-cell-padding": "^3.0.0",
+    "remark-lint-table-pipe-alignment": "^2.0.0",
+    "remark-lint-table-pipes": "^3.0.0",
+    "remark-lint-unordered-list-marker-style": "^2.0.0",
+    "unified": "^10.0.0"
+  },
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
   },
-  "xo": false
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-preset-lint-markdown-style-guide/readme.md b/packages/remark-preset-lint-markdown-style-guide/readme.md
index d9ebe6da..04ffc439 100644
--- a/packages/remark-preset-lint-markdown-style-guide/readme.md
+++ b/packages/remark-preset-lint-markdown-style-guide/readme.md
@@ -158,12 +158,18 @@ This preset configures [`remark-lint`](https://github.com/remarkjs/remark-lint)
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-preset-lint-markdown-style-guide
 ```
 
+This package exports no identifiers.
+The default export is `remarkPresetLintMarkdownStyleGuide`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -237,6 +243,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-preset-lint-markdown-style-guide/tsconfig.json b/packages/remark-preset-lint-markdown-style-guide/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-preset-lint-markdown-style-guide/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/remark-preset-lint-recommended/package.json b/packages/remark-preset-lint-recommended/package.json
index f49c8bd4..6809c942 100644
--- a/packages/remark-preset-lint-recommended/package.json
+++ b/packages/remark-preset-lint-recommended/package.json
@@ -22,26 +22,39 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "remark-lint": "^8.0.0",
     "remark-lint-final-newline": "^1.0.0",
+    "remark-lint-hard-break-spaces": "^2.0.0",
     "remark-lint-list-item-bullet-indent": "^3.0.0",
     "remark-lint-list-item-indent": "^2.0.0",
     "remark-lint-no-auto-link-without-protocol": "^2.0.0",
     "remark-lint-no-blockquote-without-marker": "^4.0.0",
-    "remark-lint-no-literal-urls": "^2.0.0",
-    "remark-lint-ordered-list-marker-style": "^2.0.0",
-    "remark-lint-hard-break-spaces": "^2.0.0",
     "remark-lint-no-duplicate-definitions": "^2.0.0",
     "remark-lint-no-heading-content-indent": "^3.0.0",
     "remark-lint-no-inline-padding": "^3.0.0",
+    "remark-lint-no-literal-urls": "^2.0.0",
     "remark-lint-no-shortcut-reference-image": "^2.0.0",
     "remark-lint-no-shortcut-reference-link": "^2.0.0",
     "remark-lint-no-undefined-references": "^3.0.0",
-    "remark-lint-no-unused-definitions": "^2.0.0"
+    "remark-lint-no-unused-definitions": "^2.0.0",
+    "remark-lint-ordered-list-marker-style": "^2.0.0",
+    "unified": "^10.0.0"
+  },
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage"
   },
-  "xo": false
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/remark-preset-lint-recommended/readme.md b/packages/remark-preset-lint-recommended/readme.md
index 2e76c0ff..09c4b30f 100644
--- a/packages/remark-preset-lint-recommended/readme.md
+++ b/packages/remark-preset-lint-recommended/readme.md
@@ -37,12 +37,18 @@ This preset configures [`remark-lint`](https://github.com/remarkjs/remark-lint)
 
 ## Install
 
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
 [npm][]:
 
 ```sh
 npm install remark-preset-lint-recommended
 ```
 
+This package exports no identifiers.
+The default export is `remarkPresetLintRecommended`.
+
 ## Use
 
 You probably want to use it on the CLI through a config file:
@@ -116,6 +122,8 @@ abide by its terms.
 
 [chat]: https://github.com/remarkjs/remark/discussions
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [health]: https://github.com/remarkjs/.github
diff --git a/packages/remark-preset-lint-recommended/tsconfig.json b/packages/remark-preset-lint-recommended/tsconfig.json
new file mode 100644
index 00000000..7e61871a
--- /dev/null
+++ b/packages/remark-preset-lint-recommended/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/unified-lint-rule/index.d.ts b/packages/unified-lint-rule/index.d.ts
new file mode 100644
index 00000000..450d01cf
--- /dev/null
+++ b/packages/unified-lint-rule/index.d.ts
@@ -0,0 +1,22 @@
+import type {Node} from 'unist'
+import type {VFile} from 'vfile'
+import type {Plugin} from 'unified'
+import type {Label, Severity} from './lib/index.js'
+
+export function lintRule<Tree extends Node = Node, Settings = unknown>(
+  name: string,
+  rule: Rule<Tree, Settings>
+): Plugin<
+  | void[]
+  | [Settings | Label | Severity]
+  | [boolean | Label | Severity, Settings],
+  Tree
+>
+
+export type Rule<Tree extends Node = Node, Settings = unknown> = (
+  node: Tree,
+  file: VFile,
+  settings: Settings
+) => Promise<Tree | undefined | void> | Tree | undefined | void
+
+export type {Severity, Label}
diff --git a/packages/unified-lint-rule/index.js b/packages/unified-lint-rule/index.js
index a7bcc156..dc0efbd8 100644
--- a/packages/unified-lint-rule/index.js
+++ b/packages/unified-lint-rule/index.js
@@ -1,97 +1 @@
-import {wrap} from 'trough'
-
-export function lintRule(id, rule) {
-  const parts = id.split(':')
-  // Possibly useful if externalised later.
-  /* c8 ignore next */
-  const source = parts[1] ? parts[0] : undefined
-  const ruleId = parts[1]
-
-  Object.defineProperty(plugin, 'name', {value: id})
-
-  return plugin
-
-  function plugin(raw) {
-    const [severity, options] = coerce(ruleId, raw)
-
-    if (!severity) return
-
-    const fatal = severity === 2
-
-    return (tree, file, next) => {
-      let index = file.messages.length - 1
-
-      wrap(rule, (error) => {
-        const messages = file.messages
-
-        // Add the error, if not already properly added.
-        // Only happens for incorrect plugins.
-        /* c8 ignore next 5 */
-        if (error && !messages.includes(error)) {
-          try {
-            file.fail(error)
-          } catch {}
-        }
-
-        while (++index < messages.length) {
-          Object.assign(messages[index], {ruleId, source, fatal})
-        }
-
-        next()
-      })(tree, file, options)
-    }
-  }
-}
-
-// Coerce a value to a severity--options tuple.
-function coerce(name, value) {
-  const def = 1
-  let result
-
-  if (typeof value === 'boolean') {
-    result = [value]
-  } else if (value === null || value === undefined) {
-    result = [def]
-  } else if (
-    Array.isArray(value) &&
-    (typeof value[0] === 'number' ||
-      typeof value[0] === 'boolean' ||
-      typeof value[0] === 'string')
-  ) {
-    result = [...value]
-  } else {
-    result = [1, value]
-  }
-
-  let level = result[0]
-
-  if (typeof level === 'boolean') {
-    level = level ? 1 : 0
-  } else if (typeof level === 'string') {
-    if (level === 'off') {
-      level = 0
-    } else if (level === 'on' || level === 'warn') {
-      level = 1
-    } else if (level === 'error') {
-      level = 2
-    } else {
-      level = 1
-      result = [level, result]
-    }
-  }
-
-  if (level < 0 || level > 2) {
-    throw new Error(
-      'Incorrect severity `' +
-        level +
-        '` for `' +
-        name +
-        '`, ' +
-        'expected 0, 1, or 2'
-    )
-  }
-
-  result[0] = level
-
-  return result
-}
+export {lintRule} from './lib/index.js'
diff --git a/packages/unified-lint-rule/lib/index.js b/packages/unified-lint-rule/lib/index.js
new file mode 100644
index 00000000..e06c26fb
--- /dev/null
+++ b/packages/unified-lint-rule/lib/index.js
@@ -0,0 +1,129 @@
+/**
+ * @typedef {import('unist').Node} Node
+ * @typedef {import('vfile').VFile} VFile
+ *
+ * @typedef {0|1|2} Severity
+ * @typedef {'warn'|'on'|'off'|'error'} Label
+ * @typedef {[Severity, ...unknown[]]} SeverityTuple
+ *
+ * @callback Rule
+ * @param {Node} tree
+ * @param {VFile} file
+ * @param {unknown} options
+ * @returns {void}
+ */
+
+import {wrap} from 'trough'
+
+const primitives = new Set(['string', 'number', 'boolean'])
+
+/**
+ * @param {string} id
+ * @param {Rule} rule
+ */
+export function lintRule(id, rule) {
+  const parts = id.split(':')
+  // Possibly useful if externalised later.
+  /* c8 ignore next */
+  const source = parts[1] ? parts[0] : undefined
+  const ruleId = parts[1]
+
+  Object.defineProperty(plugin, 'name', {value: id})
+
+  return plugin
+
+  /** @type {import('unified').Plugin<[unknown]|void[]>} */
+  function plugin(raw) {
+    const [severity, options] = coerce(ruleId, raw)
+
+    if (!severity) return
+
+    const fatal = severity === 2
+
+    return (tree, file, next) => {
+      let index = file.messages.length - 1
+
+      wrap(rule, (error) => {
+        const messages = file.messages
+
+        // Add the error, if not already properly added.
+        // Only happens for incorrect plugins.
+        /* c8 ignore next 6 */
+        // @ts-expect-error: errors could be `messages`.
+        if (error && !messages.includes(error)) {
+          try {
+            file.fail(error)
+          } catch {}
+        }
+
+        while (++index < messages.length) {
+          Object.assign(messages[index], {ruleId, source, fatal})
+        }
+
+        next()
+      })(tree, file, options)
+    }
+  }
+}
+
+/**
+ * Coerce a value to a severity--options tuple.
+ *
+ * @param {string} name
+ * @param {unknown} value
+ * @returns {SeverityTuple}
+ */
+function coerce(name, value) {
+  /** @type {unknown[]} */
+  let result
+
+  if (typeof value === 'boolean') {
+    result = [value]
+  } else if (value === null || value === undefined) {
+    result = [1]
+  } else if (
+    Array.isArray(value) &&
+    // `isArray(unknown)` is turned into `any[]`:
+    // type-coverage:ignore-next-line
+    primitives.has(typeof value[0])
+  ) {
+    // `isArray(unknown)` is turned into `any[]`:
+    // type-coverage:ignore-next-line
+    result = [...value]
+  } else {
+    result = [1, value]
+  }
+
+  let level = result[0]
+
+  if (typeof level === 'boolean') {
+    level = level ? 1 : 0
+  } else if (typeof level === 'string') {
+    if (level === 'off') {
+      level = 0
+    } else if (level === 'on' || level === 'warn') {
+      level = 1
+    } else if (level === 'error') {
+      level = 2
+    } else {
+      level = 1
+      result = [level, result]
+    }
+  }
+
+  if (typeof level !== 'number' || level < 0 || level > 2) {
+    throw new Error(
+      'Incorrect severity `' +
+        level +
+        '` for `' +
+        name +
+        '`, ' +
+        'expected 0, 1, or 2'
+    )
+  }
+
+  result[0] = level
+
+  // @ts-expect-error: it’s now a valid tuple.
+  return result
+}
diff --git a/packages/unified-lint-rule/package.json b/packages/unified-lint-rule/package.json
index 63794e27..83097fef 100644
--- a/packages/unified-lint-rule/package.json
+++ b/packages/unified-lint-rule/package.json
@@ -23,11 +23,26 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "lib/",
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
-    "trough": "^2.0.0"
+    "@types/unist": "^2.0.0",
+    "trough": "^2.0.0",
+    "unified": "^10.0.0",
+    "vfile": "^5.0.0"
   },
-  "xo": false
+  "scripts": {
+    "build": "rimraf \"lib/**/*.d.ts\" && tsc && type-coverage"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
 }
diff --git a/packages/unified-lint-rule/tsconfig.json b/packages/unified-lint-rule/tsconfig.json
new file mode 100644
index 00000000..4f4b4b06
--- /dev/null
+++ b/packages/unified-lint-rule/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["lib/**/*.js"]
+}
diff --git a/script/build-presets.js b/script/build-presets.js
index 316b0073..15a9fa06 100644
--- a/script/build-presets.js
+++ b/script/build-presets.js
@@ -1,7 +1,12 @@
+/**
+ * @typedef {import('type-fest').PackageJson} PackageJson
+ * @typedef {import('mdast').TableContent} TableContent
+ * @typedef {import('mdast').BlockContent|import('mdast').DefinitionContent} BlockContent
+ */
+
 import fs from 'fs'
 import path from 'path'
 import {inspect} from 'util'
-import {u} from 'unist-builder'
 import {parse} from 'comment-parser'
 import {remark} from 'remark'
 import remarkGfm from 'remark-gfm'
@@ -9,29 +14,45 @@ import strip from 'strip-indent'
 import parseAuthor from 'parse-author'
 import {presets} from './util/presets.js'
 
-const pkg = JSON.parse(fs.readFileSync('package.json'))
+/** @type {PackageJson} */
+const pkg = JSON.parse(String(fs.readFileSync('package.json')))
 const remote = pkg.repository
 
+if (typeof remote !== 'string') {
+  throw new TypeError(
+    'Expected `string` for `repository` in root `package.json`'
+  )
+}
+
 const own = {}.hasOwnProperty
 
 const root = path.join(process.cwd(), 'packages')
 
 presets(root).then((presetObjects) => {
   let index = -1
-  while (++index < presetObjects) {
+
+  while (++index < presetObjects.length) {
     const {name, packages} = presetObjects[index]
     const base = path.resolve(root, name)
-    const pack = JSON.parse(fs.readFileSync(path.join(base, 'package.json')))
+    /** @type {PackageJson} */
+    const pack = JSON.parse(
+      String(fs.readFileSync(path.join(base, 'package.json')))
+    )
     const doc = fs.readFileSync(path.join(base, 'index.js'), 'utf8')
     const tags = parse(doc, {spacing: 'preserve'})[0].tags
-    const author = parseAuthor(pack.author)
-    const description = strip(
-      tags.find((d) => d.tag === 'fileoverview').description
-    ).trim()
-    const rows = []
-    let children
+    const author =
+      typeof pack.author === 'string' ? parseAuthor(pack.author) : pack.author
+    const fileoverviewTag = tags.find((d) => d.tag === 'fileoverview')
+
+    if (!fileoverviewTag) {
+      throw new Error('Expected `@fileoverview` in jsdoc')
+    }
+
+    const description = strip(fileoverviewTag.description).trim()
     const short = name.replace(/^remark-/, '')
-    const camelcased = name.replace(/-(\w)/g, (_, $1) => $1.toUpperCase())
+    const camelcased = name.replace(/-(\w)/g, (_, /** @type {string} */ $1) =>
+      $1.toUpperCase()
+    )
     const org = remote.split('/').slice(0, -1).join('/')
     const main = remote + '/blob/main'
     const health = org + '/.github'
@@ -49,13 +70,18 @@ presets(root).then((presetObjects) => {
       )
     }
 
-    rows.push(
-      u('tableRow', [
-        u('tableCell', [u('text', 'Rule')]),
-        u('tableCell', [u('text', 'Setting')])
-      ])
-    )
+    /** @type {TableContent[]} */
+    const rows = []
 
+    rows.push({
+      type: 'tableRow',
+      children: [
+        {type: 'tableCell', children: [{type: 'text', value: 'Rule'}]},
+        {type: 'tableCell', children: [{type: 'text', value: 'Setting'}]}
+      ]
+    })
+
+    /** @type {string} */
     let rule
 
     for (rule in packages) {
@@ -65,94 +91,254 @@ presets(root).then((presetObjects) => {
 
         if (rule === 'remark-lint') continue
 
-        rows.push(
-          u('tableRow', [
-            u('tableCell', [
-              u('link', {url, title: null}, [u('inlineCode', rule)])
-            ]),
-            u('tableCell', option ? [u('inlineCode', inspect(option))] : [])
-          ])
-        )
+        rows.push({
+          type: 'tableRow',
+          children: [
+            {
+              type: 'tableCell',
+              children: [
+                {
+                  type: 'link',
+                  url,
+                  title: null,
+                  children: [{type: 'inlineCode', value: rule}]
+                }
+              ]
+            },
+            {
+              type: 'tableCell',
+              children: option
+                ? [{type: 'inlineCode', value: inspect(option)}]
+                : []
+            }
+          ]
+        })
       }
     }
 
-    children = [
-      u('html', '<!--This file is generated-->'),
-      u('heading', {depth: 1}, [u('text', name)]),
-      u('paragraph', [
-        u('linkReference', {identifier: 'build'}, [
-          u('imageReference', {identifier: 'build-badge', alt: 'Build'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'coverage'}, [
-          u('imageReference', {identifier: 'coverage-badge', alt: 'Coverage'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'downloads'}, [
-          u('imageReference', {identifier: 'downloads-badge', alt: 'Downloads'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'size'}, [
-          u('imageReference', {identifier: 'size-badge', alt: 'Size'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'collective'}, [
-          u('imageReference', {identifier: 'sponsors-badge', alt: 'Sponsors'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'collective'}, [
-          u('imageReference', {identifier: 'backers-badge', alt: 'Backers'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'chat'}, [
-          u('imageReference', {identifier: 'chat-badge', alt: 'Chat'})
-        ])
-      ])
-    ]
-
-    children = children.concat(remark().parse(description).children)
+    /** @type {BlockContent[]} */
+    // @ts-expect-error: fine.
+    const descriptionContent = remark().parse(description).children
 
-    children.push(
-      u('heading', {depth: 2}, [u('text', 'Rules')]),
-      u('paragraph', [
-        u('text', 'This preset configures '),
-        u('link', {url: remote}, [u('inlineCode', 'remark-lint')]),
-        u('text', ' with the following rules:')
-      ]),
-      u('table', {align: []}, rows),
-      u('heading', {depth: 2}, [u('text', 'Install')]),
-      u('paragraph', [
-        u('linkReference', {identifier: 'npm', referenceType: 'collapsed'}, [
-          u('text', 'npm')
-        ]),
-        u('text', ':')
-      ]),
-      u('code', {lang: 'sh'}, 'npm install ' + name),
-      u('heading', {depth: 2}, [u('text', 'Use')]),
-      u('paragraph', [
-        u(
-          'text',
-          'You probably want to use it on the CLI through a config file:'
-        )
-      ]),
-      u(
-        'code',
-        {lang: 'diff'},
-        [
+    /** @type {BlockContent[]} */
+    const children = [
+      {type: 'html', value: '<!--This file is generated-->'},
+      {
+        type: 'heading',
+        depth: 1,
+        children: [{type: 'text', value: name}]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'linkReference',
+            identifier: 'build',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'build-badge',
+                referenceType: 'full',
+                alt: 'Build'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'coverage',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'coverage-badge',
+                referenceType: 'full',
+                alt: 'Coverage'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'downloads',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'downloads-badge',
+                referenceType: 'full',
+                alt: 'Downloads'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'size',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'size-badge',
+                referenceType: 'full',
+                alt: 'Size'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'collective',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'sponsors-badge',
+                referenceType: 'full',
+                alt: 'Sponsors'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'collective',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'backers-badge',
+                referenceType: 'full',
+                alt: 'Backers'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'chat',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'chat-badge',
+                referenceType: 'full',
+                alt: 'Chat'
+              }
+            ]
+          }
+        ]
+      },
+      ...descriptionContent,
+      {
+        type: 'heading',
+        depth: 2,
+        children: [{type: 'text', value: 'Rules'}]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {type: 'text', value: 'This preset configures '},
+          {
+            type: 'link',
+            url: remote,
+            children: [{type: 'inlineCode', value: 'remark-lint'}]
+          },
+          {type: 'text', value: ' with the following rules:'}
+        ]
+      },
+      {type: 'table', align: [], children: rows},
+      {
+        type: 'heading',
+        depth: 2,
+        children: [{type: 'text', value: 'Install'}]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {type: 'text', value: 'This package is '},
+          {
+            type: 'linkReference',
+            identifier: 'esm',
+            referenceType: 'full',
+            children: [{type: 'text', value: 'ESM only'}]
+          },
+          {
+            type: 'text',
+            value: ':\nNode 12+ is needed to use it and it must be '
+          },
+          {type: 'inlineCode', value: 'imported'},
+          {type: 'text', value: 'ed instead of '},
+          {type: 'inlineCode', value: 'required'},
+          {type: 'text', value: 'd.'}
+        ]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'linkReference',
+            identifier: 'npm',
+            referenceType: 'collapsed',
+            children: [{type: 'text', value: 'npm'}]
+          },
+          {type: 'text', value: ':'}
+        ]
+      },
+      {type: 'code', lang: 'sh', value: 'npm install ' + name},
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'text',
+            value:
+              'This package exports no identifiers.\nThe default export is '
+          },
+          {
+            type: 'inlineCode',
+            value: name.replace(/-(\w)/g, (_, /** @type {string} */ $1) =>
+              $1.toUpperCase()
+            )
+          },
+          {type: 'text', value: '.'}
+        ]
+      },
+      {type: 'heading', depth: 2, children: [{type: 'text', value: 'Use'}]},
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'text',
+            value:
+              'You probably want to use it on the CLI through a config file:'
+          }
+        ]
+      },
+      {
+        type: 'code',
+        lang: 'diff',
+        value: [
           ' …',
           ' "remarkConfig": {',
           '+  "plugins": ["' + short + '"]',
           ' }',
           ' …'
         ].join('\n')
-      ),
-      u('paragraph', [u('text', 'Or use it on the CLI directly')]),
-      u('code', {lang: 'sh'}, 'remark -u ' + short + ' readme.md'),
-      u('paragraph', [u('text', 'Or use this on the API:')]),
-      u(
-        'code',
-        {lang: 'diff'},
-        [
+      },
+      {
+        type: 'paragraph',
+        children: [{type: 'text', value: 'Or use it on the CLI directly'}]
+      },
+      {type: 'code', lang: 'sh', value: 'remark -u ' + short + ' readme.md'},
+      {
+        type: 'paragraph',
+        children: [{type: 'text', value: 'Or use this on the API:'}]
+      },
+      {
+        type: 'code',
+        lang: 'diff',
+        value: [
           " import {remark} from 'remark'",
           " import {reporter} from 'vfile-reporter'",
           ' import ' + camelcased + " from '" + name + "'",
@@ -164,110 +350,189 @@ presets(root).then((presetObjects) => {
           '     console.error(reporter(file))',
           '   })'
         ].join('\n')
-      ),
-      u('heading', {depth: 2}, [u('text', 'Contribute')]),
-      u('paragraph', [
-        u('text', 'See '),
-        u('linkReference', {identifier: 'contributing'}, [
-          u('inlineCode', 'contributing.md')
-        ]),
-        u('text', ' in '),
-        u('linkReference', {identifier: 'health'}, [
-          u('inlineCode', health.split('/').slice(-2).join('/'))
-        ]),
-        u('text', ' for ways\nto get started.\nSee '),
-        u('linkReference', {identifier: 'support'}, [
-          u('inlineCode', 'support.md')
-        ]),
-        u('text', ' for ways to get help.')
-      ]),
-      u('paragraph', [
-        u('text', 'This project has a '),
-        u('linkReference', {identifier: 'coc'}, [u('text', 'code of conduct')]),
-        u(
-          'text',
-          '.\nBy interacting with this repository, organization, or community you agree to\nabide by its terms.'
-        )
-      ]),
-      u('heading', {depth: 2}, [u('text', 'License')]),
-      u('paragraph', [
-        u('linkReference', {identifier: 'license'}, [u('text', pack.license)]),
-        u('text', ' © '),
-        u('linkReference', {identifier: 'author'}, [u('text', author.name)])
-      ]),
-      u('definition', {
+      },
+      {
+        type: 'heading',
+        depth: 2,
+        children: [{type: 'text', value: 'Contribute'}]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {type: 'text', value: 'See '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'contributing',
+            children: [{type: 'inlineCode', value: 'contributing.md'}]
+          },
+          {type: 'text', value: ' in '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'health',
+            children: [
+              {type: 'inlineCode', value: health.split('/').slice(-2).join('/')}
+            ]
+          },
+          {type: 'text', value: ' for ways\nto get started.\nSee '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'support',
+            children: [{type: 'inlineCode', value: 'support.md'}]
+          },
+          {type: 'text', value: ' for ways to get help.'}
+        ]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {type: 'text', value: 'This project has a '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'coc',
+            children: [{type: 'text', value: 'code of conduct'}]
+          },
+          {
+            type: 'text',
+            value:
+              '.\nBy interacting with this repository, organization, or community you agree to\nabide by its terms.'
+          }
+        ]
+      },
+      {type: 'heading', depth: 2, children: [{type: 'text', value: 'License'}]},
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'license',
+            children: [{type: 'text', value: String(pack.license || '')}]
+          },
+          {type: 'text', value: ' © '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'author',
+            children: [
+              {type: 'text', value: String((author && author.name) || '')}
+            ]
+          }
+        ]
+      },
+      {
+        type: 'definition',
         identifier: 'build-badge',
         url: 'https://github.com/' + slug + '/workflows/main/badge.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'build',
         url: 'https://github.com/' + slug + '/actions'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'coverage-badge',
         url: 'https://img.shields.io/codecov/c/github/' + slug + '.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'coverage',
         url: 'https://codecov.io/github/' + slug
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'downloads-badge',
         url: 'https://img.shields.io/npm/dm/' + name + '.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'downloads',
         url: 'https://www.npmjs.com/package/' + name
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'size-badge',
         url: 'https://img.shields.io/bundlephobia/minzip/' + name + '.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'size',
         url: 'https://bundlephobia.com/result?p=' + name
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'sponsors-badge',
         url: 'https://opencollective.com/unified/sponsors/badge.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'backers-badge',
         url: 'https://opencollective.com/unified/backers/badge.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'collective',
         url: 'https://opencollective.com/unified'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'chat-badge',
         url: 'https://img.shields.io/badge/chat-discussions-success.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'chat',
         url: 'https://github.com/remarkjs/remark/discussions'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
+        identifier: 'esm',
+        url: 'https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c'
+      },
+      {
+        type: 'definition',
         identifier: 'npm',
         url: 'https://docs.npmjs.com/cli/install'
-      }),
-      u('definition', {identifier: 'health', url: health}),
-      u('definition', {
+      },
+      {
+        type: 'definition',
+        identifier: 'health',
+        url: health
+      },
+      {
+        type: 'definition',
         identifier: 'contributing',
         url: hMain + '/contributing.md'
-      }),
-      u('definition', {identifier: 'support', url: hMain + '/support.md'}),
-      u('definition', {
+      },
+      {
+        type: 'definition',
+        identifier: 'support',
+        url: hMain + '/support.md'
+      },
+      {
+        type: 'definition',
         identifier: 'coc',
         url: hMain + '/code-of-conduct.md'
-      }),
-      u('definition', {identifier: 'license', url: main + '/license'}),
-      u('definition', {identifier: 'author', url: author.url})
-    )
+      },
+      {
+        type: 'definition',
+        identifier: 'license',
+        url: main + '/license'
+      },
+      {
+        type: 'definition',
+        identifier: 'author',
+        url: String((author && author.url) || '')
+      }
+    ]
 
     fs.writeFileSync(
       path.join(base, 'readme.md'),
-      remark().use(remarkGfm).stringify(u('root', children))
+      remark().use(remarkGfm).stringify({type: 'root', children})
     )
 
     console.log('✓ wrote `readme.md` in `' + name + '`')
diff --git a/script/build-rules.js b/script/build-rules.js
index ad019464..e43e7bef 100644
--- a/script/build-rules.js
+++ b/script/build-rules.js
@@ -1,7 +1,12 @@
+/**
+ * @typedef {import('type-fest').PackageJson} PackageJson
+ * @typedef {import('mdast').BlockContent|import('mdast').DefinitionContent} BlockContent
+ * @typedef {import('mdast').TableContent} TableContent
+ */
+
 import fs from 'fs'
 import path from 'path'
 import {inspect} from 'util'
-import {u} from 'unist-builder'
 import {remark} from 'remark'
 import remarkGfm from 'remark-gfm'
 import parseAuthor from 'parse-author'
@@ -12,10 +17,19 @@ import {characters} from './characters.js'
 
 const own = {}.hasOwnProperty
 
-const pkg = JSON.parse(fs.readFileSync('package.json'))
+/** @type {PackageJson} */
+const pkg = JSON.parse(String(fs.readFileSync('package.json')))
 const remote = pkg.repository
+
+if (typeof remote !== 'string') {
+  throw new TypeError(
+    'Expected `string` for `repository` in root `package.json`'
+  )
+}
+
 const root = path.join(process.cwd(), 'packages')
 
+// eslint-disable-next-line complexity
 presets(root).then((presetObjects) => {
   const allRules = rules(root)
   let index = -1
@@ -23,51 +37,29 @@ presets(root).then((presetObjects) => {
   while (++index < allRules.length) {
     const basename = allRules[index]
     const base = path.resolve(root, basename)
-    const pack = JSON.parse(fs.readFileSync(path.join(base, 'package.json')))
+    /** @type {PackageJson} */
+    const pack = JSON.parse(
+      String(fs.readFileSync(path.join(base, 'package.json')))
+    )
     const info = rule(base)
     const tests = info.tests
-    const author = parseAuthor(pack.author)
+    const author =
+      typeof pack.author === 'string' ? parseAuthor(pack.author) : pack.author
     const short = basename.replace(/^remark-/, '')
-    const camelcased = basename.replace(/-(\w)/g, (_, $1) => $1.toUpperCase())
+    const camelcased = basename.replace(
+      /-(\w)/g,
+      (_, /** @type {string} */ $1) => $1.toUpperCase()
+    )
     const org = remote.split('/').slice(0, -1).join('/')
     const main = remote + '/blob/main'
     const health = org + '/.github'
     const hMain = health + '/blob/HEAD'
     const slug = remote.split('/').slice(-2).join('/')
     let hasGfm = false
-    let children = [
-      u('html', '<!--This file is generated-->'),
-      u('heading', {depth: 1}, [u('text', basename)]),
-      u('paragraph', [
-        u('linkReference', {identifier: 'build'}, [
-          u('imageReference', {identifier: 'build-badge', alt: 'Build'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'coverage'}, [
-          u('imageReference', {identifier: 'coverage-badge', alt: 'Coverage'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'downloads'}, [
-          u('imageReference', {identifier: 'downloads-badge', alt: 'Downloads'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'size'}, [
-          u('imageReference', {identifier: 'size-badge', alt: 'Size'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'collective'}, [
-          u('imageReference', {identifier: 'sponsors-badge', alt: 'Sponsors'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'collective'}, [
-          u('imageReference', {identifier: 'backers-badge', alt: 'Backers'})
-        ]),
-        u('text', '\n'),
-        u('linkReference', {identifier: 'chat'}, [
-          u('imageReference', {identifier: 'chat-badge', alt: 'Chat'})
-        ])
-      ])
-    ].concat(remark().parse(info.description).children)
+
+    /** @type {BlockContent[]} */
+    // @ts-expect-error: fine.
+    const descriptionContent = remark().parse(info.description).children
 
     if (basename !== pack.name) {
       throw new Error(
@@ -83,56 +75,214 @@ presets(root).then((presetObjects) => {
       return basename in preset.packages
     })
 
-    children.push(u('heading', {depth: 2}, [u('text', 'Presets')]))
+    /** @type {BlockContent[]} */
+    const children = [
+      {type: 'html', value: '<!--This file is generated-->'},
+      {
+        type: 'heading',
+        depth: 1,
+        children: [{type: 'text', value: basename}]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'linkReference',
+            identifier: 'build',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'build-badge',
+                referenceType: 'full',
+                alt: 'Build'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'coverage',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'coverage-badge',
+                referenceType: 'full',
+                alt: 'Coverage'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'downloads',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'downloads-badge',
+                referenceType: 'full',
+                alt: 'Downloads'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'size',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'size-badge',
+                referenceType: 'full',
+                alt: 'Size'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'collective',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'sponsors-badge',
+                referenceType: 'full',
+                alt: 'Sponsors'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'collective',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'backers-badge',
+                referenceType: 'full',
+                alt: 'Backers'
+              }
+            ]
+          },
+          {type: 'text', value: '\n'},
+          {
+            type: 'linkReference',
+            identifier: 'chat',
+            referenceType: 'full',
+            children: [
+              {
+                type: 'imageReference',
+                identifier: 'chat-badge',
+                referenceType: 'full',
+                alt: 'Chat'
+              }
+            ]
+          }
+        ]
+      },
+      ...descriptionContent,
+      {
+        type: 'heading',
+        depth: 2,
+        children: [{type: 'text', value: 'Presets'}]
+      }
+    ]
 
     if (includes.length === 0) {
-      children.push(
-        u('paragraph', [
-          u('text', 'This rule is not included in any default preset')
-        ])
-      )
+      children.push({
+        type: 'paragraph',
+        children: [
+          {
+            type: 'text',
+            value: 'This rule is not included in any default preset'
+          }
+        ]
+      })
     } else {
       children.push(
-        u('paragraph', [
-          u('text', 'This rule is included in the following presets:')
-        ]),
-        u(
-          'table',
-          {align: []},
-          [
-            u('tableRow', [
-              u('tableCell', [u('text', 'Preset')]),
-              u('tableCell', [u('text', 'Setting')])
-            ])
-          ].concat(
-            includes.map((preset) => {
-              const url = remote + '/tree/main/packages/' + preset.name
-              const option = preset.packages[pack.name]
-
-              return u('tableRow', [
-                u('tableCell', [
-                  u('link', {url, title: null}, [u('inlineCode', preset.name)])
-                ]),
-                u('tableCell', option ? [u('inlineCode', inspect(option))] : [])
-              ])
+        {
+          type: 'paragraph',
+          children: [
+            {
+              type: 'text',
+              value: 'This rule is included in the following presets:'
+            }
+          ]
+        },
+        {
+          type: 'table',
+          align: [],
+          children: [
+            {
+              type: 'tableRow',
+              children: [
+                {
+                  type: 'tableCell',
+                  children: [{type: 'text', value: 'Preset'}]
+                },
+                {
+                  type: 'tableCell',
+                  children: [{type: 'text', value: 'Setting'}]
+                }
+              ]
+            },
+            ...includes.map((preset) => {
+              const option = preset.packages[basename]
+
+              /** @type {TableContent} */
+              const row = {
+                type: 'tableRow',
+                children: [
+                  {
+                    type: 'tableCell',
+                    children: [
+                      {
+                        type: 'link',
+                        url: remote + '/tree/main/packages/' + preset.name,
+                        title: null,
+                        children: [{type: 'inlineCode', value: preset.name}]
+                      }
+                    ]
+                  },
+                  {
+                    type: 'tableCell',
+                    children: option
+                      ? [{type: 'inlineCode', value: inspect(option)}]
+                      : []
+                  }
+                ]
+              }
+
+              return row
             })
-          )
-        )
+          ]
+        }
       )
     }
 
-    let setting
     let first = true
+    /** @type {string} */
+    let setting
 
     for (setting in tests) {
       if (own.call(tests, setting)) {
         const fixtures = tests[setting]
 
         if (first) {
-          children.push(u('heading', {depth: 2}, [u('text', 'Example')]))
+          children.push({
+            type: 'heading',
+            depth: 2,
+            children: [{type: 'text', value: 'Example'}]
+          })
           first = false
         }
 
+        /** @type {string} */
         let fileName
 
         for (fileName in fixtures) {
@@ -141,16 +291,21 @@ presets(root).then((presetObjects) => {
             const label = inspect(JSON.parse(setting))
             let clean = fixture.input
 
-            children.push(u('heading', {depth: 5}, [u('inlineCode', fileName)]))
+            children.push({
+              type: 'heading',
+              depth: 5,
+              children: [{type: 'inlineCode', value: fileName}]
+            })
 
             if (label !== 'true') {
-              children.push(
-                u('paragraph', [
-                  u('text', 'When configured with '),
-                  u('inlineCode', label),
-                  u('text', '.')
-                ])
-              )
+              children.push({
+                type: 'paragraph',
+                children: [
+                  {type: 'text', value: 'When configured with '},
+                  {type: 'inlineCode', value: label},
+                  {type: 'text', value: '.'}
+                ]
+              })
             }
 
             if (
@@ -158,21 +313,28 @@ presets(root).then((presetObjects) => {
               fixture.input !== undefined &&
               fixture.input.trim() !== ''
             ) {
-              children.push(u('heading', {depth: 6}, [u('text', 'In')]))
+              children.push({
+                type: 'heading',
+                depth: 6,
+                children: [{type: 'text', value: 'In'}]
+              })
 
               if (fixture.gfm) {
                 hasGfm = true
-                children.push(
-                  u('paragraph', [
-                    u('text', 'Note: this example uses '),
-                    u(
-                      'linkReference',
-                      {label: 'GFM', referenceType: 'collapsed'},
-                      [u('text', 'GFM')]
-                    ),
-                    u('text', '.')
-                  ])
-                )
+                children.push({
+                  type: 'paragraph',
+                  children: [
+                    {type: 'text', value: 'Note: this example uses '},
+                    {
+                      type: 'linkReference',
+                      label: 'GFM',
+                      identifier: 'gfm',
+                      referenceType: 'collapsed',
+                      children: [{type: 'text', value: 'GFM'}]
+                    },
+                    {type: 'text', value: '.'}
+                  ]
+                })
               }
 
               let index = -1
@@ -181,55 +343,120 @@ presets(root).then((presetObjects) => {
                 const next = clean.replace(char.in, char.out)
 
                 if (clean !== next) {
-                  children.push(
-                    u('paragraph', [
-                      u('text', 'Note: '),
-                      u('inlineCode', char.char),
-                      u('text', ' represents ' + char.name + '.')
-                    ])
-                  )
+                  children.push({
+                    type: 'paragraph',
+                    children: [
+                      {type: 'text', value: 'Note: '},
+                      {type: 'inlineCode', value: char.char},
+                      {type: 'text', value: ' represents ' + char.name + '.'}
+                    ]
+                  })
 
                   clean = next
                 }
               }
 
-              children.push(u('code', {lang: 'markdown'}, fixture.input))
+              children.push({
+                type: 'code',
+                lang: 'markdown',
+                value: fixture.input
+              })
             }
 
-            children.push(u('heading', {depth: 6}, [u('text', 'Out')]))
+            children.push({
+              type: 'heading',
+              depth: 6,
+              children: [{type: 'text', value: 'Out'}]
+            })
 
             if (fixture.output.length === 0) {
-              children.push(u('paragraph', [u('text', 'No messages.')]))
+              children.push({
+                type: 'paragraph',
+                children: [{type: 'text', value: 'No messages.'}]
+              })
             } else {
-              children.push(
-                u('code', {lang: 'text'}, fixture.output.join('\n'))
-              )
+              children.push({
+                type: 'code',
+                lang: 'text',
+                value: fixture.output.join('\n')
+              })
             }
           }
         }
       }
     }
 
-    children = children.concat([
-      u('heading', {depth: 2}, [u('text', 'Install')]),
-      u('paragraph', [
-        u('linkReference', {identifier: 'npm', referenceType: 'collapsed'}, [
-          u('text', 'npm')
-        ]),
-        u('text', ':')
-      ]),
-      u('code', {lang: 'sh'}, 'npm install ' + basename),
-      u('heading', {depth: 2}, [u('text', 'Use')]),
-      u('paragraph', [
-        u(
-          'text',
-          'You probably want to use it on the CLI through a config file:'
-        )
-      ]),
-      u(
-        'code',
-        {lang: 'diff'},
-        [
+    children.push(
+      {
+        type: 'heading',
+        depth: 2,
+        children: [{type: 'text', value: 'Install'}]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {type: 'text', value: 'This package is '},
+          {
+            type: 'linkReference',
+            identifier: 'esm',
+            referenceType: 'full',
+            children: [{type: 'text', value: 'ESM only'}]
+          },
+          {
+            type: 'text',
+            value: ':\nNode 12+ is needed to use it and it must be '
+          },
+          {type: 'inlineCode', value: 'imported'},
+          {type: 'text', value: 'ed instead of '},
+          {type: 'inlineCode', value: 'required'},
+          {type: 'text', value: 'd.'}
+        ]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'linkReference',
+            identifier: 'npm',
+            referenceType: 'collapsed',
+            children: [{type: 'text', value: 'npm'}]
+          },
+          {type: 'text', value: ':'}
+        ]
+      },
+      {type: 'code', lang: 'sh', value: 'npm install ' + basename},
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'text',
+            value:
+              'This package exports no identifiers.\nThe default export is '
+          },
+          {
+            type: 'inlineCode',
+            value: basename.replace(/-(\w)/g, (_, /** @type {string} */ $1) =>
+              $1.toUpperCase()
+            )
+          },
+          {type: 'text', value: '.'}
+        ]
+      },
+      {type: 'heading', depth: 2, children: [{type: 'text', value: 'Use'}]},
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'text',
+            value:
+              'You probably want to use it on the CLI through a config file:'
+          }
+        ]
+      },
+      {
+        type: 'code',
+        lang: 'diff',
+        value: [
           ' …',
           ' "remarkConfig": {',
           '   "plugins": [',
@@ -241,14 +468,24 @@ presets(root).then((presetObjects) => {
           ' }',
           ' …'
         ].join('\n')
-      ),
-      u('paragraph', [u('text', 'Or use it on the CLI directly')]),
-      u('code', {lang: 'sh'}, 'remark -u lint -u ' + short + ' readme.md'),
-      u('paragraph', [u('text', 'Or use this on the API:')]),
-      u(
-        'code',
-        {lang: 'diff'},
-        [
+      },
+      {
+        type: 'paragraph',
+        children: [{type: 'text', value: 'Or use it on the CLI directly'}]
+      },
+      {
+        type: 'code',
+        lang: 'sh',
+        value: 'remark -u lint -u ' + short + ' readme.md'
+      },
+      {
+        type: 'paragraph',
+        children: [{type: 'text', value: 'Or use this on the API:'}]
+      },
+      {
+        type: 'code',
+        lang: 'diff',
+        value: [
           " import {remark} from 'remark'",
           " import {reporter} from 'vfile-reporter'",
           " import remarkLint from 'remark-lint'",
@@ -262,119 +499,197 @@ presets(root).then((presetObjects) => {
           '     console.error(reporter(file))',
           '   })'
         ].join('\n')
-      ),
-      u('heading', {depth: 2}, [u('text', 'Contribute')]),
-      u('paragraph', [
-        u('text', 'See '),
-        u('linkReference', {identifier: 'contributing'}, [
-          u('inlineCode', 'contributing.md')
-        ]),
-        u('text', ' in '),
-        u('linkReference', {identifier: 'health'}, [
-          u('inlineCode', health.split('/').slice(-2).join('/'))
-        ]),
-        u('text', ' for ways\nto get started.\nSee '),
-        u('linkReference', {identifier: 'support'}, [
-          u('inlineCode', 'support.md')
-        ]),
-        u('text', ' for ways to get help.')
-      ]),
-      u('paragraph', [
-        u('text', 'This project has a '),
-        u('linkReference', {identifier: 'coc'}, [u('text', 'code of conduct')]),
-        u(
-          'text',
-          '.\nBy interacting with this repository, organization, or community you agree to\nabide by its terms.'
-        )
-      ]),
-      u('heading', {depth: 2}, [u('text', 'License')]),
-      u('paragraph', [
-        u('linkReference', {identifier: 'license'}, [u('text', pack.license)]),
-        u('text', ' © '),
-        u('linkReference', {identifier: 'author'}, [u('text', author.name)])
-      ]),
-      u('definition', {
+      },
+      {
+        type: 'heading',
+        depth: 2,
+        children: [{type: 'text', value: 'Contribute'}]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {type: 'text', value: 'See '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'contributing',
+            children: [{type: 'inlineCode', value: 'contributing.md'}]
+          },
+          {type: 'text', value: ' in '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'health',
+            children: [
+              {type: 'inlineCode', value: health.split('/').slice(-2).join('/')}
+            ]
+          },
+          {type: 'text', value: ' for ways\nto get started.\nSee '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'support',
+            children: [{type: 'inlineCode', value: 'support.md'}]
+          },
+          {type: 'text', value: ' for ways to get help.'}
+        ]
+      },
+      {
+        type: 'paragraph',
+        children: [
+          {type: 'text', value: 'This project has a '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'coc',
+            children: [{type: 'text', value: 'code of conduct'}]
+          },
+          {
+            type: 'text',
+            value:
+              '.\nBy interacting with this repository, organization, or community you agree to\nabide by its terms.'
+          }
+        ]
+      },
+      {type: 'heading', depth: 2, children: [{type: 'text', value: 'License'}]},
+      {
+        type: 'paragraph',
+        children: [
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'license',
+            children: [{type: 'text', value: String(pack.license || '')}]
+          },
+          {type: 'text', value: ' © '},
+          {
+            type: 'linkReference',
+            referenceType: 'collapsed',
+            identifier: 'author',
+            children: [
+              {type: 'text', value: String((author && author.name) || '')}
+            ]
+          }
+        ]
+      },
+      {
+        type: 'definition',
         identifier: 'build-badge',
         url: 'https://github.com/' + slug + '/workflows/main/badge.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'build',
         url: 'https://github.com/' + slug + '/actions'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'coverage-badge',
         url: 'https://img.shields.io/codecov/c/github/' + slug + '.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'coverage',
         url: 'https://codecov.io/github/' + slug
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'downloads-badge',
         url: 'https://img.shields.io/npm/dm/' + basename + '.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'downloads',
         url: 'https://www.npmjs.com/package/' + basename
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'size-badge',
         url: 'https://img.shields.io/bundlephobia/minzip/' + basename + '.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'size',
         url: 'https://bundlephobia.com/result?p=' + basename
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'sponsors-badge',
         url: 'https://opencollective.com/unified/sponsors/badge.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'backers-badge',
         url: 'https://opencollective.com/unified/backers/badge.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'collective',
         url: 'https://opencollective.com/unified'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'chat-badge',
         url: 'https://img.shields.io/badge/chat-discussions-success.svg'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
         identifier: 'chat',
         url: 'https://github.com/remarkjs/remark/discussions'
-      }),
-      u('definition', {
+      },
+      {
+        type: 'definition',
+        identifier: 'esm',
+        url: 'https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c'
+      },
+      {
+        type: 'definition',
         identifier: 'npm',
         url: 'https://docs.npmjs.com/cli/install'
-      }),
-      u('definition', {identifier: 'health', url: health}),
-      u('definition', {
+      },
+      {
+        type: 'definition',
+        identifier: 'health',
+        url: health
+      },
+      {
+        type: 'definition',
         identifier: 'contributing',
         url: hMain + '/contributing.md'
-      }),
-      u('definition', {identifier: 'support', url: hMain + '/support.md'}),
-      u('definition', {
+      },
+      {
+        type: 'definition',
+        identifier: 'support',
+        url: hMain + '/support.md'
+      },
+      {
+        type: 'definition',
         identifier: 'coc',
         url: hMain + '/code-of-conduct.md'
-      }),
-      u('definition', {identifier: 'license', url: main + '/license'}),
-      u('definition', {identifier: 'author', url: author.url})
-    ])
+      },
+      {
+        type: 'definition',
+        identifier: 'license',
+        url: main + '/license'
+      },
+      {
+        type: 'definition',
+        identifier: 'author',
+        url: String((author && author.url) || '')
+      }
+    )
 
     if (hasGfm) {
-      children.push(
-        u('definition', {
-          identifier: 'gfm',
-          url: 'https://github.com/remarkjs/remark-gfm'
-        })
-      )
+      children.push({
+        type: 'definition',
+        identifier: 'gfm',
+        url: 'https://github.com/remarkjs/remark-gfm'
+      })
     }
 
     fs.writeFileSync(
       path.join(base, 'readme.md'),
-      remark().use(remarkGfm).stringify(u('root', children))
+      remark().use(remarkGfm).stringify({type: 'root', children})
     )
 
     console.log('✓ wrote `readme.md` in `' + basename + '`')
diff --git a/script/plugin/list-of-presets.js b/script/plugin/list-of-presets.js
index b90f1831..9de6e559 100644
--- a/script/plugin/list-of-presets.js
+++ b/script/plugin/list-of-presets.js
@@ -1,42 +1,64 @@
+/**
+ * @typedef {import('type-fest').PackageJson} PackageJson
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').List} List
+ * @typedef {import('mdast').ListItem} ListItem
+ */
+
 import fs from 'fs'
 import path from 'path'
 import {zone} from 'mdast-zone'
-import {u} from 'unist-builder'
 import {presets} from '../util/presets.js'
 
 const root = path.join(process.cwd(), 'packages')
 
+/** @type {import('unified').Plugin<void[], Root>} */
 export default function listOfPresets() {
   const presetPromise = presets(root)
 
   return async (tree) => {
     const presetObjects = await presetPromise
 
-    zone(tree, 'presets', (start, nodes, end) => {
-      return [
-        start,
-        u(
-          'list',
-          {ordered: false, spread: false},
-          presetObjects.map(({name}) => {
-            const pack = JSON.parse(
-              fs.readFileSync(path.join(root, name, 'package.json'))
-            )
-            const description = pack.description.replace(
-              /^remark preset to configure remark-lint with ?/i,
-              ''
-            )
-
-            return u('listItem', {spread: false}, [
-              u('paragraph', [
-                u('link', {url: pack.repository}, [u('inlineCode', name)]),
-                u('text', ' — ' + description)
-              ])
-            ])
-          })
-        ),
-        end
-      ]
+    zone(tree, 'presets', (start, _, end) => {
+      /** @type {List} */
+      const list = {
+        type: 'list',
+        ordered: false,
+        spread: false,
+        children: presetObjects.map(({name}) => {
+          /** @type {PackageJson} */
+          const pack = JSON.parse(
+            String(fs.readFileSync(path.join(root, name, 'package.json')))
+          )
+          const description = String(pack.description || '').replace(
+            /^remark preset to configure remark-lint with ?/i,
+            ''
+          )
+
+          /** @type {ListItem} */
+          const item = {
+            type: 'listItem',
+            spread: false,
+            children: [
+              {
+                type: 'paragraph',
+                children: [
+                  {
+                    type: 'link',
+                    url: String(pack.repository || ''),
+                    children: [{type: 'inlineCode', value: name}]
+                  },
+                  {type: 'text', value: ' — ' + description}
+                ]
+              }
+            ]
+          }
+
+          return item
+        })
+      }
+
+      return [start, list, end]
     })
   }
 }
diff --git a/script/plugin/list-of-rules.js b/script/plugin/list-of-rules.js
index 7f6ee992..f6cdc1a0 100644
--- a/script/plugin/list-of-rules.js
+++ b/script/plugin/list-of-rules.js
@@ -1,43 +1,61 @@
+/**
+ * @typedef {import('type-fest').PackageJson} PackageJson
+ * @typedef {import('mdast').ListItem} ListItem
+ * @typedef {import('mdast').List} List
+ * @typedef {import('mdast').Root} Root
+ */
+
 import fs from 'fs'
 import path from 'path'
 import {zone} from 'mdast-zone'
-import {u} from 'unist-builder'
 import {rules} from '../util/rules.js'
 
 const root = path.join(process.cwd(), 'packages')
 
+/** @type {import('unified').Plugin<void[], Root>} */
 export default function listOfRules() {
-  return transformer
-}
+  return (tree) => {
+    zone(tree, 'rules', (start, _, end) => {
+      /** @type {List} */
+      const list = {
+        type: 'list',
+        ordered: false,
+        spread: false,
+        children: rules(root).map((basename) => {
+          const name = basename.slice('remark-lint-'.length)
+          /** @type {PackageJson} */
+          const pack = JSON.parse(
+            String(fs.readFileSync(path.join(root, basename, 'package.json')))
+          )
+          const description = String(pack.description || '').replace(
+            /^remark-lint rule to ?/i,
+            ''
+          )
 
-function transformer(tree) {
-  zone(tree, 'rules', replace)
-}
+          /** @type {ListItem} */
+          const item = {
+            type: 'listItem',
+            spread: false,
+            children: [
+              {
+                type: 'paragraph',
+                children: [
+                  {
+                    type: 'link',
+                    url: String(pack.repository || ''),
+                    children: [{type: 'inlineCode', value: name}]
+                  },
+                  {type: 'text', value: ' — ' + description}
+                ]
+              }
+            ]
+          }
 
-function replace(start, nodes, end) {
-  return [
-    start,
-    u(
-      'list',
-      {ordered: false, spread: false},
-      rules(root).map((basename) => {
-        const name = basename.slice('remark-lint-'.length)
-        const pack = JSON.parse(
-          fs.readFileSync(path.join(root, basename, 'package.json'))
-        )
-        const description = pack.description.replace(
-          /^remark-lint rule to ?/i,
-          ''
-        )
+          return item
+        })
+      }
 
-        return u('listItem', {spread: false}, [
-          u('paragraph', [
-            u('link', {url: pack.repository}, [u('inlineCode', name)]),
-            u('text', ' — ' + description)
-          ])
-        ])
-      })
-    ),
-    end
-  ]
+      return [start, list, end]
+    })
+  }
 }
diff --git a/script/util/presets.js b/script/util/presets.js
index 7e1c3e3b..061c9c8c 100644
--- a/script/util/presets.js
+++ b/script/util/presets.js
@@ -1,7 +1,16 @@
+/**
+ * @typedef {import('unified').Preset} Preset
+ * @typedef {import('unified').Plugin} Plugin
+ */
+
 import {promises as fs} from 'fs'
 import path from 'path'
 import url from 'url'
 
+/**
+ * @param {string} base
+ * @returns {Promise<Array.<{name: string, packages: Record<string, unknown>}>>}
+ */
 export async function presets(base) {
   const files = (await fs.readdir(base)).filter((basename) =>
     /remark-preset-lint/.test(basename)
@@ -9,30 +18,52 @@ export async function presets(base) {
 
   return Promise.all(
     files.map(async (name) => {
-      const plugins = (
-        await import(url.pathToFileURL(path.join(base, name, 'index.js')))
-      ).default.plugins
+      const href = url.pathToFileURL(path.join(base, name, 'index.js')).href
+      /** @type {Preset} */
+      // type-coverage:ignore-next-line
+      const preset = (await import(href)).default
+      const plugins = preset.plugins || []
+      /** @type {Record<string, unknown>} */
       const packages = {}
 
       let index = -1
       while (++index < plugins.length) {
         const plugin = plugins[index]
+        /** @type {Plugin} */
         let fn
+        /** @type {unknown} */
         let option
 
         if (typeof plugin === 'function') {
           fn = plugin
-        } else {
+        } else if (Array.isArray(plugin)) {
+          // Fine:
+          // type-coverage:ignore-next-line
           fn = plugin[0]
+          // Fine:
+          // type-coverage:ignore-next-line
           option = plugin[1]
+        } else {
+          throw new TypeError(
+            'Expected plugin, plugin tuple, not `' + plugin + '`'
+          )
         }
 
+        /** @type {string} */
+        // @ts-expect-error: `displayName`s are fine.
         const name = fn.displayName || fn.name
 
         packages[
           name
-            .replace(/[:-](\w)/g, (_, $1) => $1.toUpperCase())
-            .replace(/[A-Z]/g, ($0) => '-' + $0.toLowerCase())
+            .replace(
+              /[:-](\w)/g,
+              (/** @type {string} */ _, /** @type {string} */ $1) =>
+                $1.toUpperCase()
+            )
+            .replace(
+              /[A-Z]/g,
+              (/** @type {string} */ $0) => '-' + $0.toLowerCase()
+            )
         ] = option
       }
 
diff --git a/script/util/rule.js b/script/util/rule.js
index a54a6247..4e75fee7 100755
--- a/script/util/rule.js
+++ b/script/util/rule.js
@@ -1,17 +1,52 @@
+/**
+ * @typedef Rule
+ * @property {string} ruleId
+ * @property {string} description
+ * @property {Record<string, Checks>} tests
+ * @property {string} filePath
+ *
+ * @typedef {Record<string, Check>} Checks
+ *
+ * @typedef Check
+ * @property {string} input
+ * @property {string[]} output
+ * @property {string} setting
+ * @property {boolean} gfm
+ * @property {boolean} positionless
+ */
+
 import fs from 'fs'
 import path from 'path'
 import {parse} from 'comment-parser'
 import strip from 'strip-indent'
 
-// Get information for a rule at `filePath`.
+/**
+ * Get information for a rule at `filePath`.
+ *
+ * @param {string} filePath
+ * @returns {Rule}
+ */
 export function rule(filePath) {
   const ruleId = path.basename(filePath).slice('remark-lint-'.length)
-  const result = {}
+  /** @type {Record<string, Checks>} */
   const tests = {}
   const code = fs.readFileSync(path.join(filePath, 'index.js'), 'utf-8')
   const tags = parse(code, {spacing: 'preserve'})[0].tags
-  const name = tags.find((d) => d.tag === 'module').name
-  let description = tags.find((d) => d.tag === 'fileoverview').description
+  const moduleTag = tags.find((d) => d.tag === 'module')
+  const fileoverviewTag = tags.find((d) => d.tag === 'fileoverview')
+
+  /* c8 ignore next 3 */
+  if (!moduleTag) {
+    throw new Error('Expected `@module` in JSDoc')
+  }
+
+  /* c8 ignore next 3 */
+  if (!fileoverviewTag) {
+    throw new Error('Expected `@fileoverview` in JSDoc')
+  }
+
+  const name = moduleTag.name
+  let description = fileoverviewTag.description
 
   /* c8 ignore next 3 */
   if (name !== ruleId) {
@@ -25,10 +60,13 @@ export function rule(filePath) {
 
   description = strip(description)
 
-  result.ruleId = ruleId
-  result.description = description.trim()
-  result.tests = tests
-  result.filePath = filePath
+  /** @type {Rule} */
+  const result = {
+    ruleId,
+    description: description.trim(),
+    tests,
+    filePath
+  }
 
   const examples = tags
     .filter((d) => d.tag === 'example')
@@ -37,6 +75,7 @@ export function rule(filePath) {
 
   while (++index < examples.length) {
     const lines = examples[index].split('\n')
+    /** @type {{name: string, label?: 'input'|'output', setting?: unknown, positionless?: boolean, gfm?: boolean}} */
     let info
 
     try {
@@ -52,17 +91,12 @@ export function rule(filePath) {
     const exampleValue = strip(lines.join('\n').replace(/^\r?\n/g, ''))
     const setting = JSON.stringify(info.setting || true)
     const name = info.name
-    let context = tests[setting]
-
-    if (!context) {
-      context = []
-      tests[setting] = context
-    }
+    const context = setting in tests ? tests[setting] : (tests[setting] = {})
 
     if (!info.label) {
       context[name] = {
-        positionless: info.positionless,
-        gfm: info.gfm,
+        positionless: info.positionless || false,
+        gfm: info.gfm || false,
         setting,
         input: exampleValue,
         output: []
@@ -83,7 +117,13 @@ export function rule(filePath) {
     }
 
     if (!context[name]) {
-      context[name] = {positionless: info.positionless, gfm: info.gfm}
+      context[name] = {
+        positionless: info.positionless || false,
+        gfm: info.gfm || false,
+        setting: '',
+        input: '',
+        output: []
+      }
     }
 
     context[name].setting = setting
diff --git a/script/util/rules.js b/script/util/rules.js
index 6de22224..28f78b5f 100644
--- a/script/util/rules.js
+++ b/script/util/rules.js
@@ -1,5 +1,9 @@
 import fs from 'fs'
 
+/**
+ * @param {string} filePath
+ * @returns {string[]}
+ */
 export function rules(filePath) {
   return fs
     .readdirSync(filePath)
diff --git a/test.js b/test.js
index 5984a702..0a6aa0a1 100644
--- a/test.js
+++ b/test.js
@@ -1,3 +1,11 @@
+/**
+ * @typedef {import('unified').Plugin} Plugin
+ * @typedef {import('vfile-message').VFileMessage} VFileMessage
+ * @typedef {import('tape').Test} Test
+ * @typedef {import('./script/util/rule').Rule} Rule
+ * @typedef {import('./script/util/rule').Check} Check
+ */
+
 import url from 'url'
 import path from 'path'
 import test from 'tape'
@@ -15,240 +23,204 @@ import finalNewline from './packages/remark-lint-final-newline/index.js'
 
 const own = {}.hasOwnProperty
 
-test('core', (t) => {
-  t.test('should work', (t) => {
-    const doc = [
-      '# A heading',
-      '',
-      '# Another main heading.',
-      '',
-      '<!--lint ignore-->',
-      '',
-      '# Another main heading.'
-    ].join('\n')
-
-    t.plan(2)
-
-    remark()
-      .use(noHeadingPunctuation)
-      .use(noMultipleToplevelHeadings)
-      .use(lint)
-      .process(toVFile({path: 'virtual.md', value: doc}), (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [
-            null,
-            'virtual.md:3:1-3:24: Don’t add a trailing `.` to headings',
-            'virtual.md:3:1-3:24: Don’t use multiple top level headings (1:1)'
-          ],
-          'should support `remark-lint` last'
-        )
-      })
+test('core', async (t) => {
+  const doc = [
+    '# A heading',
+    '',
+    '# Another main heading.',
+    '',
+    '<!--lint ignore-->',
+    '',
+    '# Another main heading.'
+  ].join('\n')
+
+  t.deepEqual(
+    asStrings(
+      (
+        await remark()
+          .use(noHeadingPunctuation)
+          .use(noMultipleToplevelHeadings)
+          .use(lint)
+          .process(toVFile({path: 'virtual.md', value: doc}))
+      ).messages
+    ),
+    [
+      'virtual.md:3:1-3:24: Don’t add a trailing `.` to headings',
+      'virtual.md:3:1-3:24: Don’t use multiple top level headings (1:1)'
+    ],
+    'should support `remark-lint` last'
+  )
 
-    remark()
-      .use(lint)
-      .use(noHeadingPunctuation)
-      .use(noMultipleToplevelHeadings)
-      .process(toVFile({path: 'virtual.md', value: doc}), (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [
-            null,
-            'virtual.md:3:1-3:24: Don’t add a trailing `.` to headings',
-            'virtual.md:3:1-3:24: Don’t use multiple top level headings (1:1)'
-          ],
-          'should support `remark-lint` first'
-        )
-      })
-  })
-
-  t.test('should support no rules', (t) => {
-    t.plan(1)
-
-    remark()
-      .use(lint)
-      .process('.', (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [null],
-          'should warn for missing new lines'
-        )
-      })
-  })
-
-  t.test('should support successful rules', (t) => {
-    t.plan(1)
-
-    remark()
-      .use(finalNewline)
-      .process('', (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [null],
-          'should support successful rules'
-        )
-      })
-  })
-
-  t.test('should support a list with a severity', (t) => {
-    t.plan(2)
-
-    remark()
-      .use(finalNewline, [2])
-      .process('.', (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [null, '1:1: Missing newline character at end of file'],
-          'should emit fatally (1)'
-        )
-        t.equal(file.messages[0].fatal, true, 'should emit fatally (2)')
-      })
-  })
-
-  t.test('should support a boolean (`true`)', (t) => {
-    // Note! This is handled by unified.
-    t.plan(1)
-
-    remark()
-      .use(finalNewline, true)
-      .process('.', (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [null, '1:1: Missing newline character at end of file'],
-          'should emit'
-        )
-      })
-  })
-
-  t.test('should support a boolean (`false`)', (t) => {
-    // Note! This is handled by unified.
-    t.plan(1)
-
-    remark()
-      .use(finalNewline, false)
-      .process('.', (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [null],
-          'should not emit'
-        )
-      })
-  })
-
-  t.test(
-    'should support a list with a boolean severity (true, for on)',
-    (t) => {
-      t.plan(1)
-
-      remark()
-        .use(finalNewline, [true])
-        .process('.', (error, file) => {
-          t.deepEqual(
-            [error].concat(file.messages.map((d) => String(d))),
-            [null, '1:1: Missing newline character at end of file'],
-            'should emit'
-          )
-        })
-    }
+  t.deepEqual(
+    asStrings(
+      (
+        await remark()
+          .use(lint)
+          .use(noHeadingPunctuation)
+          .use(noMultipleToplevelHeadings)
+          .process(toVFile({path: 'virtual.md', value: doc}))
+      ).messages
+    ),
+    [
+      'virtual.md:3:1-3:24: Don’t add a trailing `.` to headings',
+      'virtual.md:3:1-3:24: Don’t use multiple top level headings (1:1)'
+    ],
+    'should support `remark-lint` first'
   )
 
-  t.test(
-    'should support a list with boolean severity (false, for off)',
-    (t) => {
-      t.plan(1)
-
-      remark()
-        .use(finalNewline, [false])
-        .process('.', (error, file) => {
-          t.deepEqual(
-            [error].concat(file.messages.map((d) => String(d))),
-            [null],
-            'should not emit'
-          )
-        })
-    }
+  t.deepEqual(
+    asStrings((await remark().use(lint).process('.')).messages),
+    [],
+    'should support no rules'
   )
 
-  t.test('should support a list with string severity (`error`)', (t) => {
-    t.plan(2)
-
-    remark()
-      .use(finalNewline, ['error'])
-      .process('.', (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [null, '1:1: Missing newline character at end of file'],
-          'should emit fatally (1)'
-        )
-        t.equal(file.messages[0].fatal, true, 'should emit fatally (2)')
-      })
-  })
-
-  t.test('should support a list with a string severity (`on`)', (t) => {
-    t.plan(2)
-
-    remark()
-      .use(finalNewline, ['on'])
-      .process('.', (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [null, '1:1: Missing newline character at end of file'],
-          'should message'
-        )
-        t.equal(file.messages[0].fatal, false, 'should not emit fatally')
-      })
-  })
-
-  t.test('should support a list with a string severity (`warn`)', (t) => {
-    t.plan(2)
-
-    remark()
-      .use(finalNewline, ['warn'])
-      .process('.', (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [null, '1:1: Missing newline character at end of file'],
-          'should message'
-        )
-        t.equal(file.messages[0].fatal, false, 'should not emit fatally')
-      })
-  })
-
-  t.test('should support a list with a string severity (`off`)', (t) => {
-    t.plan(1)
-
-    remark()
-      .use(finalNewline, ['off'])
-      .process('.', (error, file) => {
-        t.deepEqual(
-          [error].concat(file.messages.map((d) => String(d))),
-          [null],
-          'should disable `final-newline`'
-        )
-      })
-  })
-
-  t.test('should fail on incorrect severities', (t) => {
-    t.throws(
-      () => {
-        remark().use(finalNewline, [3]).freeze()
-      },
-      /^Error: Incorrect severity `3` for `final-newline`, expected 0, 1, or 2$/,
-      'should throw when too high'
-    )
-
-    t.throws(
-      () => {
-        remark().use(finalNewline, [-1]).freeze()
-      },
-      /^Error: Incorrect severity `-1` for `final-newline`, expected 0, 1, or 2$/,
-      'should throw too low'
-    )
-
-    t.end()
-  })
+  t.deepEqual(
+    asStrings((await remark().use(finalNewline).process('')).messages),
+    [],
+    'should support successful rules'
+  )
 
-  t.end()
+  t.deepEqual(
+    (await remark().use(finalNewline, [2]).process('.')).messages.map((d) =>
+      JSON.parse(JSON.stringify(d))
+    ),
+    [
+      {
+        name: '1:1',
+        message: 'Missing newline character at end of file',
+        reason: 'Missing newline character at end of file',
+        line: null,
+        column: null,
+        source: 'remark-lint',
+        ruleId: 'final-newline',
+        position: {
+          start: {line: null, column: null},
+          end: {line: null, column: null}
+        },
+        fatal: true
+      }
+    ],
+    'should support a list with a severity'
+  )
+
+  t.deepEqual(
+    asStrings((await remark().use(finalNewline, true).process('.')).messages),
+    ['1:1: Missing newline character at end of file'],
+    'should support a boolean (`true`)'
+  )
+
+  t.deepEqual(
+    asStrings((await remark().use(finalNewline, false).process('.')).messages),
+    [],
+    'should support a boolean (`false`)'
+  )
+
+  t.deepEqual(
+    asStrings((await remark().use(finalNewline, [true]).process('.')).messages),
+    ['1:1: Missing newline character at end of file'],
+    'should support a list with a boolean severity (true, for on)'
+  )
+
+  t.deepEqual(
+    asStrings(
+      (await remark().use(finalNewline, [false]).process('.')).messages
+    ),
+    [],
+    'should support a list with boolean severity (false, for off)'
+  )
+
+  t.deepEqual(
+    (await remark().use(finalNewline, ['error']).process('.')).messages.map(
+      (d) => JSON.parse(JSON.stringify(d))
+    ),
+    [
+      {
+        name: '1:1',
+        message: 'Missing newline character at end of file',
+        reason: 'Missing newline character at end of file',
+        line: null,
+        column: null,
+        source: 'remark-lint',
+        ruleId: 'final-newline',
+        position: {
+          start: {line: null, column: null},
+          end: {line: null, column: null}
+        },
+        fatal: true
+      }
+    ],
+    'should support a list with string severity (`error`)'
+  )
+
+  t.deepEqual(
+    (await remark().use(finalNewline, ['on']).process('.')).messages.map((d) =>
+      JSON.parse(JSON.stringify(d))
+    ),
+    [
+      {
+        name: '1:1',
+        message: 'Missing newline character at end of file',
+        reason: 'Missing newline character at end of file',
+        line: null,
+        column: null,
+        source: 'remark-lint',
+        ruleId: 'final-newline',
+        position: {
+          start: {line: null, column: null},
+          end: {line: null, column: null}
+        },
+        fatal: false
+      }
+    ],
+    'should support a list with string severity (`on`)'
+  )
+
+  t.deepEqual(
+    (await remark().use(finalNewline, ['warn']).process('.')).messages.map(
+      (d) => JSON.parse(JSON.stringify(d))
+    ),
+    [
+      {
+        name: '1:1',
+        message: 'Missing newline character at end of file',
+        reason: 'Missing newline character at end of file',
+        line: null,
+        column: null,
+        source: 'remark-lint',
+        ruleId: 'final-newline',
+        position: {
+          start: {line: null, column: null},
+          end: {line: null, column: null}
+        },
+        fatal: false
+      }
+    ],
+    'should support a list with string severity (`warn`)'
+  )
+
+  t.deepEqual(
+    asStrings(
+      (await remark().use(finalNewline, ['off']).process('.')).messages
+    ),
+    [],
+    'should support a list with string severity (`off`)'
+  )
+
+  t.throws(
+    () => {
+      remark().use(finalNewline, [3]).freeze()
+    },
+    /^Error: Incorrect severity `3` for `final-newline`, expected 0, 1, or 2$/,
+    'should fail on incorrect severities (too high)'
+  )
+
+  t.throws(
+    () => {
+      remark().use(finalNewline, [-1]).freeze()
+    },
+    /^Error: Incorrect severity `-1` for `final-newline`, expected 0, 1, or 2$/,
+    'should fail on incorrect severities (too low)'
+  )
 })
 
 test('rules', async (t) => {
@@ -260,8 +232,11 @@ test('rules', async (t) => {
     const basename = all[index]
     const base = path.resolve(root, basename)
     const info = rule(base)
-    const fn = (await import(url.pathToFileURL(base).href + '/index.js'))
-      .default
+    const href = url.pathToFileURL(base).href + '/index.js'
+
+    /** @type {Plugin} */
+    // type-coverage:ignore-next-line
+    const fn = (await import(href)).default
 
     if (Object.keys(info.tests).length === 0) {
       t.pass(info.ruleId + ': no tests')
@@ -275,17 +250,26 @@ test('rules', async (t) => {
   t.end()
 })
 
-// Assert a rule.
+/**
+ * Assert a rule.
+ *
+ * @param {Test} t
+ * @param {Plugin} rule
+ * @param {Rule} info
+ */
 function assertRule(t, rule, info) {
   const tests = info.tests
+  /** @type {string} */
   let setting
 
   for (setting in tests) {
     if (own.call(tests, setting)) {
       const checks = tests[setting]
+      /** @type {unknown} */
       const options = JSON.parse(setting)
 
       t.test(setting, (t) => {
+        /** @type {string} */
         let name
 
         for (name in checks) {
@@ -305,6 +289,14 @@ function assertRule(t, rule, info) {
   t.end()
 }
 
+/**
+ * @param {Test} t
+ * @param {Plugin} rule
+ * @param {Rule} info
+ * @param {Check} fixture
+ * @param {string} basename
+ * @param {unknown} settings
+ */
 /* eslint-disable-next-line max-params */
 function assertFixture(t, rule, info, fixture, basename, settings) {
   const ruleId = info.ruleId
@@ -346,25 +338,36 @@ function assertFixture(t, rule, info, fixture, basename, settings) {
 
   if (!positionless) {
     file.messages = []
-    proc = remark().use(clear).use(rule, settings)
+    proc = remark()
+      .use(() => (tree) => removePosition(tree))
+      .use(rule, settings)
     if (fixture.gfm) proc.use(remarkGfm)
     proc.processSync(file)
 
     t.deepEqual(normalize(file.messages), [], 'should equal without position')
   }
-
-  function clear() {
-    return removePosition
-  }
 }
 
+/**
+ * @param {VFileMessage[]} messages
+ * @returns {string[]}
+ */
 function normalize(messages) {
-  return messages.map((message) => {
-    const value = String(message)
-    return value.slice(value.indexOf(':') + 1)
-  })
+  return asStrings(messages).map((value) => value.slice(value.indexOf(':') + 1))
+}
+
+/**
+ * @param {VFileMessage[]} messages
+ * @returns {string[]}
+ */
+function asStrings(messages) {
+  return messages.map((message) => String(message))
 }
 
+/**
+ * @param {string} value
+ * @returns {string}
+ */
 function preprocess(value) {
   let index = -1
 
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..3c7623ba
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,17 @@
+{
+  "include": ["script/**/*.js", "test.js"],
+  "compilerOptions": {
+    "target": "ES2020",
+    "lib": ["ES2020"],
+    "module": "ES2020",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "allowJs": true,
+    "checkJs": true,
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    "allowSyntheticDefaultImports": true,
+    "skipLibCheck": true,
+    "strict": true
+  }
+}