feat: fallback to async API on processSync error via synckit

.travis.yml

@@ -18,7 +18,6 @@ before_install:
 install: yarn --frozen-lockfile
 
 script:
-  - yarn build
   - yarn lint
   - yarn test
 

package.json

@@ -18,6 +18,7 @@
     "lint:es": "cross-env PARSER_NO_WATCH=true eslint . --cache --ext js,md,ts -f friendly",
     "lint:ts": "tslint -p . -t stylish",
     "postinstall": "simple-git-hooks && yarn-deduplicate --strategy fewer || exit 0",
+    "prelint": "yarn build",
     "prerelease": "yarn build",
     "release": "lerna publish --conventional-commits --create-release github --yes",
     "test": "jest",
@@ -35,6 +36,7 @@
     "lerna": "^4.0.0",
     "npm-run-all": "^4.1.5",
     "react": "^17.0.2",
+    "remark-validate-links": "^10.0.4",
     "ts-jest": "^26.5.5",
     "ts-node": "^9.1.1",
     "tslint": "^6.1.3",

packages/eslint-plugin-mdx/package.json

@@ -39,6 +39,7 @@
     "remark-mdx": "^1.6.22",
     "remark-parse": "^8.0.3",
     "remark-stringify": "^8.1.1",
+    "synckit": "^0.1.5",
     "tslib": "^2.2.0",
     "unified": "^9.2.1",
     "vfile": "^4.2.1"

packages/eslint-plugin-mdx/src/rules/remark.ts

@@ -3,10 +3,16 @@ import path from 'path'
 import type { Rule } from 'eslint'
 import type { ParserOptions } from 'eslint-mdx'
 import { DEFAULT_EXTENSIONS, MARKDOWN_EXTENSIONS } from 'eslint-mdx'
+import { createSyncFn } from 'synckit'
+import type { FrozenProcessor } from 'unified'
 import vfile from 'vfile'
 
 import { getPhysicalFilename, getRemarkProcessor } from './helpers'
-import type { RemarkLintMessage } from './types'
+import type { ProcessSync, RemarkLintMessage } from './types'
+
+const processSync = createSyncFn(require.resolve('../worker')) as ProcessSync
+
+const brokenCache = new WeakMap<FrozenProcessor, true>()
 
 export const remark: Rule.RuleModule = {
   meta: {
@@ -36,22 +42,45 @@ export const remark: Rule.RuleModule = {
         if (!isMdx && !isMarkdown) {
           return
         }
+
+        const physicalFilename = getPhysicalFilename(filename)
+
         const sourceText = sourceCode.getText(node)
-        const remarkProcessor = getRemarkProcessor(
-          getPhysicalFilename(filename),
-          isMdx,
-        )
-        const file = vfile({
+        const remarkProcessor = getRemarkProcessor(physicalFilename, isMdx)
+
+        const fileOptions = {
           path: filename,
           contents: sourceText,
-        })
+        }
 
-        try {
-          remarkProcessor.processSync(file)
-        } catch (err) {
-          /* istanbul ignore next */
-          if (!file.messages.includes(err)) {
-            file.message(err).fatal = true
+        const file = vfile(fileOptions)
+
+        let broken = brokenCache.get(remarkProcessor)
+
+        if (broken) {
+          const { messages } = processSync(fileOptions, physicalFilename, isMdx)
+          file.messages = messages
+        } else {
+          try {
+            remarkProcessor.processSync(file)
+          } catch (err) {
+            /* istanbul ignore else */
+            if (
+              (err as Error).message ===
+              '`processSync` finished async. Use `process` instead'
+            ) {
+              brokenCache.set(remarkProcessor, (broken = true))
+              const { messages } = processSync(
+                fileOptions,
+                physicalFilename,
+                isMdx,
+              )
+              file.messages = messages
+            } else {
+              if (!file.messages.includes(err)) {
+                file.message(err).fatal = true
+              }
+            }
           }
         }
 
@@ -102,11 +131,14 @@ export const remark: Rule.RuleModule = {
                 end.offset == null ? start.offset + 1 : end.offset,
               ]
               const partialText = sourceText.slice(...range)
-              const fixed = remarkProcessor.processSync(partialText).toString()
+              const fixed = broken
+                ? processSync(partialText, physicalFilename, isMdx)
+                : remarkProcessor.processSync(partialText).toString()
               return fixer.replaceTextRange(
                 range,
-                /* istanbul ignore next */
-                partialText.endsWith('\n') ? fixed : fixed.slice(0, -1), // remove redundant new line
+                partialText.endsWith('\n')
+                  ? /* istanbul ignore next */ fixed
+                  : fixed.slice(0, -1), // remove redundant new line
               )
             },
           })

packages/eslint-plugin-mdx/src/rules/types.ts

@@ -1,6 +1,7 @@
 import type { Linter } from 'eslint'
 import type { ExpressionStatement, Node } from 'estree'
 import type { Attacher } from 'unified'
+import type { VFile, VFileOptions } from 'vfile'
 
 export interface WithParent {
   parent: NodeWithParent
@@ -25,3 +26,16 @@ export interface RemarkLintMessage {
   ruleId: string
   severity: Linter.Severity
 }
+
+export interface ProcessSync {
+  (text: string, physicalFilename: string, isFile: boolean): string
+  (fileOptions: VFileOptions, physicalFilename: string, isFile: boolean): Pick<
+    VFile,
+    'messages'
+  >
+  (
+    textOrFileOptions: string | VFileOptions,
+    physicalFilename: string,
+    isFile: boolean,
+  ): string | VFileOptions
+}

packages/eslint-plugin-mdx/src/worker.ts

@@ -0,0 +1,27 @@
+import { runAsWorker } from 'synckit'
+import type { VFileOptions } from 'vfile'
+import vfile from 'vfile'
+
+import { getRemarkProcessor } from './rules'
+
+// eslint-disable-next-line @typescript-eslint/no-floating-promises
+runAsWorker(
+  async (
+    textOrFileOptions: string | VFileOptions,
+    physicalFilename: string,
+    isMdx: boolean,
+  ) => {
+    const remarkProcessor = getRemarkProcessor(physicalFilename, isMdx)
+    const file = vfile(textOrFileOptions)
+    try {
+      await remarkProcessor.process(file)
+    } catch (err) {
+      if (!file.messages.includes(err)) {
+        file.message(err).fatal = true
+      }
+    }
+    return typeof textOrFileOptions === 'string'
+      ? file.toString()
+      : { messages: file.messages }
+  },
+)

test/fixtures/async/.remarkrc

@@ -0,0 +1,8 @@
+{
+  "plugins": [
+    [
+      "validate-links",
+      2
+    ]
+  ]
+}

test/remark.test.ts

@@ -41,11 +41,16 @@ ruleTester.run('remark 1', remark, {
       parserOptions,
       // dark hack
       get filename() {
-        // eslint-disable-next-line @typescript-eslint/no-unsafe-call, @typescript-eslint/no-unsafe-member-access
         processorCache.clear()
         return path.resolve(userDir, '../test.md')
       },
     },
+    {
+      code: '<header>Header6</header>',
+      parser,
+      parserOptions,
+      filename: path.resolve(__dirname, 'fixtures/async/test.mdx'),
+    },
   ],
   invalid: [
     {
@@ -68,5 +73,25 @@ ruleTester.run('remark 1', remark, {
         },
       ],
     },
+    {
+      code: '[CHANGELOG](./CHANGELOG.md)',
+      parser,
+      parserOptions,
+      filename: path.resolve(__dirname, 'fixtures/async/test.mdx'),
+      errors: [
+        {
+          message: JSON.stringify({
+            reason: 'Link to unknown file: `CHANGELOG.md`',
+            source: 'remark-validate-links',
+            ruleId: 'missing-file',
+            severity: 1,
+          }),
+          line: 1,
+          column: 1,
+          endLine: 1,
+          endColumn: 28,
+        },
+      ],
+    },
   ],
 })

tsconfig.eslint.json

@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.base",
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "eslint-mdx": ["packages/eslint-mdx/src"],
+      "eslint-plugin-mdx": ["packages/eslint-plugin-mdx/src"]
+    }
+  }
+}

tsconfig.json

@@ -1,5 +1,5 @@
 {
-  "extends": "./tsconfig.base.json",
+  "extends": "./tsconfig.base",
   "compilerOptions": {
     "noEmit": true
   },

yarn.lock

@@ -4847,6 +4847,11 @@ emittery@^0.7.1:
   resolved "https://registry.yarnpkg.com/emittery/-/emittery-0.7.2.tgz#25595908e13af0f5674ab419396e2fb394cdfa82"
   integrity sha512-A8OG5SR/ij3SsJdWDJdkkSYUjQdCUx6APQXem0SaEePBSRg4eymGYwBkKo1Y6DU+af/Jn2dBQqDBvjnr9Vi8nQ==
 
+"emoji-regex@>=6.0.0 <=6.1.1":
+  version "6.1.1"
+  resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-6.1.1.tgz#c6cd0ec1b0642e2a3c67a1137efc5e796da4f88e"
+  integrity sha1-xs0OwbBkLio8Z6ETfvxeeW2k+I4=
+
 emoji-regex@^8.0.0:
   version "8.0.0"
   resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-8.0.0.tgz#e818fd69ce5ccfcb404594f842963bf53164cc37"
@@ -5855,6 +5860,13 @@ gitconfiglocal@^1.0.0:
   dependencies:
     ini "^1.3.2"
 
+github-slugger@^1.0.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/github-slugger/-/github-slugger-1.3.0.tgz#9bd0a95c5efdfc46005e82a906ef8e2a059124c9"
+  integrity sha512-gwJScWVNhFYSRDvURk/8yhcFBee6aFjye2a7Lhb2bUyRulpIoek9p0I9Kt7PT67d/nUlZbFu8L9RLiA0woQN8Q==
+  dependencies:
+    emoji-regex ">=6.0.0 <=6.1.1"
+
 glob-parent@^5.0.0, glob-parent@^5.1.0, glob-parent@^5.1.1:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-5.1.2.tgz#869832c58034fe68a4093c17dc15e8340d8401c4"
@@ -6054,6 +6066,13 @@ hosted-git-info@^2.1.4:
   resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-2.8.8.tgz#7539bd4bc1e0e0a895815a2e0262420b12858488"
   integrity sha512-f/wzC2QaWBs7t9IYqB4T3sR1xviIViXJRJTWBlx2Gf3g0Xi5vI7Yy4koXQ1c9OYDGHN9sBy1DQ2AB8fqZBWhUg==
 
+hosted-git-info@^3.0.0:
+  version "3.0.8"
+  resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-3.0.8.tgz#6e35d4cc87af2c5f816e4cb9ce350ba87a3f370d"
+  integrity sha512-aXpmwoOhRBrw6X3j0h5RloK4x1OzsxMPyxqIHyNfSe2pypkVTZFpEiRoSipPEPlMrh0HW/XsjkJ5WgnCirpNUw==
+  dependencies:
+    lru-cache "^6.0.0"
+
 hosted-git-info@^4.0.1:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-4.0.2.tgz#5e425507eede4fea846b7262f0838456c4209961"
@@ -7362,6 +7381,11 @@ leven@^3.1.0:
   resolved "https://registry.yarnpkg.com/leven/-/leven-3.1.0.tgz#77891de834064cccba82ae7842bb6b14a13ed7f2"
   integrity sha512-qsda+H8jTaUaN/x5vzW2rzc+8Rw4TAQ/4KjB46IwK5VH+IlVeeeje/EoZRpiXvIqjFgK84QffqPztGI3VBLG1A==
 
+levenshtein-edit-distance@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/levenshtein-edit-distance/-/levenshtein-edit-distance-1.0.0.tgz#895baf478cce8b5c1a0d27e45d7c1d978a661e49"
+  integrity sha1-iVuvR4zOi1waDSfkXXwdl4pmHkk=
+
 levn@^0.4.1:
   version "0.4.1"
   resolved "https://registry.yarnpkg.com/levn/-/levn-0.4.1.tgz#ae4562c007473b932a6200d403268dd2fffc6ade"
@@ -7733,7 +7757,7 @@ mdast-util-heading-style@^1.0.2:
   resolved "https://registry.yarnpkg.com/mdast-util-heading-style/-/mdast-util-heading-style-1.0.6.tgz#6410418926fd5673d40f519406b35d17da10e3c5"
   integrity sha512-8ZuuegRqS0KESgjAGW8zTx4tJ3VNIiIaGFNEzFpRSAQBavVc7AvOo9I4g3crcZBfYisHs4seYh0rAVimO6HyOw==
 
-mdast-util-to-string@^1.0.2:
+mdast-util-to-string@^1.0.0, mdast-util-to-string@^1.0.2:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/mdast-util-to-string/-/mdast-util-to-string-1.1.0.tgz#27055500103f51637bd07d01da01eb1967a43527"
   integrity sha512-jVU0Nr2B9X3MU4tSK7JP1CMkSvOj7X5l/GboG1tKRw52lLF1x2Ju92Ms9tNetCcbfX3hzlM73zYo2NKkWSfF/A==
@@ -9287,6 +9311,13 @@ prop-types@^15.7.2:
     object-assign "^4.1.1"
     react-is "^16.8.1"
 
+propose@0.0.5:
+  version "0.0.5"
+  resolved "https://registry.yarnpkg.com/propose/-/propose-0.0.5.tgz#48a065d9ec7d4c8667f4050b15c4a2d85dbca56b"
+  integrity sha1-SKBl2ex9TIZn9AULFcSi2F28pWs=
+  dependencies:
+    levenshtein-edit-distance "^1.0.0"
+
 proto-list@~1.2.1:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/proto-list/-/proto-list-1.2.4.tgz#212d5bfe1318306a420f6402b8e26ff39647a849"
@@ -10343,6 +10374,19 @@ remark-stringify@^8.1.1:
     unherit "^1.0.4"
     xtend "^4.0.1"
 
+remark-validate-links@^10.0.4:
+  version "10.0.4"
+  resolved "https://registry.yarnpkg.com/remark-validate-links/-/remark-validate-links-10.0.4.tgz#a2711fa794f691c944faf8126767152dcfee0c47"
+  integrity sha512-oNGRcsoQkL35WoZKLMMBugDwvHfyu0JPA5vSYkEcvR6YBsFKBo4RedpecuokTK1wgD9l01rPxaQ9dPmRQYFhyg==
+  dependencies:
+    github-slugger "^1.0.0"
+    hosted-git-info "^3.0.0"
+    mdast-util-to-string "^1.0.0"
+    propose "0.0.5"
+    to-vfile "^6.0.0"
+    trough "^1.0.0"
+    unist-util-visit "^2.0.0"
+
 remove-trailing-separator@^1.0.1:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz#c24bce2a283adad5bc3f58e0d48249b92379d8ef"
@@ -11325,6 +11369,14 @@ symbol-tree@^3.2.4:
   resolved "https://registry.yarnpkg.com/symbol-tree/-/symbol-tree-3.2.4.tgz#430637d248ba77e078883951fb9aa0eed7c63fa2"
   integrity sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==
 
+synckit@^0.1.5:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/synckit/-/synckit-0.1.5.tgz#f34462b2e3686bba3dbea2ae13b6e01adff2ffb8"
+  integrity sha512-s9rDbMJAF5SDEwBGH/DvbN/fb5N1Xu1boL4Uv66idbCbtosNX3ikUsFvGhROmPXsvlMYMcT5ksmkU5RSnkFi9Q==
+  dependencies:
+    tslib "^2.2.0"
+    uuid "^8.3.2"
+
 table@^6.0.4:
   version "6.0.9"
   resolved "https://registry.yarnpkg.com/table/-/table-6.0.9.tgz#790a12bf1e09b87b30e60419bafd6a1fd85536fb"
@@ -11504,6 +11556,14 @@ to-regex@^3.0.1, to-regex@^3.0.2:
     regex-not "^1.0.2"
     safe-regex "^1.1.0"
 
+to-vfile@^6.0.0:
+  version "6.1.0"
+  resolved "https://registry.yarnpkg.com/to-vfile/-/to-vfile-6.1.0.tgz#5f7a3f65813c2c4e34ee1f7643a5646344627699"
+  integrity sha512-BxX8EkCxOAZe+D/ToHdDsJcVI4HqQfmw0tCkp31zf3dNP/XWIAjU4CmeuSwsSoOzOTqHPOL0KUzyZqJplkD0Qw==
+  dependencies:
+    is-buffer "^2.0.0"
+    vfile "^4.0.0"
+
 tough-cookie@^2.3.3, tough-cookie@~2.5.0:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.5.0.tgz#cd9fb2a0aa1d5a12b473bd9fb96fa3dcff65ade2"
@@ -12064,7 +12124,7 @@ uuid@^3.3.2:
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.4.0.tgz#b23e4358afa8a202fe7a100af1f5f883f02007ee"
   integrity sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==
 
-uuid@^8.3.0:
+uuid@^8.3.0, uuid@^8.3.2:
   version "8.3.2"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-8.3.2.tgz#80d5b5ced271bb9af6c445f21a1a04c606cefbe2"
   integrity sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==