Convert codebase to TypeScript

.eslintignore

@@ -0,0 +1,2 @@
+src/types/intl.d.ts
+src/luxon.d.ts

.eslintrc.js

@@ -1,19 +1,33 @@
 module.exports = {
-  parser: "babel-eslint",
-  extends: ["standard", "plugin:prettier/recommended"],
-  plugins: ["import", "prettier", "babel"],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    project: "./tsconfig.json",
+    ecmaVersion: "2020",
+  },
+  extends: [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/recommended-requiring-type-checking",
+    "prettier",
+    "prettier/@typescript-eslint", // Uses eslint-config-prettier to disable ESLint rules from @typescript-eslint/eslint-plugin that would conflict with prettier
+  ],
+  plugins: ["import", "prettier", "@typescript-eslint"],
   rules: {
-    "linebreak-style": "off",
-    "one-var": "off",
     "spaced-comment": ["error", "always", { exceptions: ["-"] }],
     "valid-jsdoc": "off",
     "prettier/prettier": "warn",
-    "prefer-const": ["error", { destructuring: "all" }]
-  },
-  parserOptions: {
-    ecmaVersion: "2020"
+    "prefer-const": ["error", { destructuring: "all" }],
+    "@typescript-eslint/explicit-function-return-type": "off",
+    "@typescript-eslint/prefer-includes": "off", // Only available in es2016
+    "@typescript-eslint/no-unused-vars": [
+      "error",
+      { argsIgnorePattern: "^_", varsIgnorePattern: "^_" },
+    ],
+    "@typescript-eslint/unbound-method": "off",
+    "@typescript-eslint/no-use-before-define": "off",
   },
   env: {
-    es6: true
-  }
+    es6: true,
+  },
 };

.gitignore

@@ -1,6 +1,7 @@
-node_modules
+node_modules/
 .tern-port
-/build
+build/
+transpiled/
 #*
 .#*
 coverage/

.travis.yml

@@ -1,14 +1,14 @@
 sudo: true
 services:
- - docker
+  - docker
 before_install:
   - docker pull icambron/luxon
   - ./docker/npm install
 script:
   - ./docker/npm run build
+  - ./docker/npm run tsc
   - ./docker/npm run lint
   - ./docker/npm run test
   - ./docker/npm run docs
   - ./docker/npm run check-doc-coverage
   - bash <(curl -s https://codecov.io/bash)
-

benchmarks/datetime.js

@@ -29,7 +29,7 @@ suite
   })
   .add("DateTime.fromFormat with zone", () => {
     DateTime.fromFormat("1982/05/25 09:10:11.445", "yyyy/MM/dd HH:mm:ss.SSS", {
-      zone: "America/Los_Angeles"
+      zone: "America/Los_Angeles",
     });
   })
   .add("DateTime#setZone", () => {
@@ -57,11 +57,13 @@ suite
   .add("DateTime#toRelativeCalendar", () => {
     dt.toRelativeCalendar({ base: DateTime.local(), locale: "fi" });
   })
-  .on("cycle", event => {
+  .on("cycle", (event) => {
+    // eslint-disable-next-line no-undef
     console.log(String(event.target));
   })
   // eslint-disable-next-line func-names
-  .on("complete", function() {
+  .on("complete", function () {
+    // eslint-disable-next-line no-undef
     console.log("Fastest is " + this.filter("fastest").map("name"));
   })
   .run();

docs/index.js

@@ -21,7 +21,7 @@ const manualFiles = [
 const excludeIrrelevant = ["luxon\\.js", "luxonFilled\\.js", "impl/.*\\.js"];
 
 module.exports = {
-  source: "./src",
+  source: "./transpiled/src",
   destination: "./build/docs",
   excludes: excludeIrrelevant,
   plugins: [

jest.config.js

@@ -2,5 +2,13 @@ module.exports = {
   testEnvironment: "node",
   roots: ["test", "src"],
   coverageDirectory: "build/coverage",
-  collectCoverageFrom: ["src/**/*.js", "!src/zone.js", "!src/luxonFilled.js"]
+  collectCoverageFrom: [
+    "src/**/*.ts",
+    "!src/zone.ts",
+    "!src/luxonFilled.ts",
+    "!src/luxon.d.ts",
+    "!src/types/intl.d.ts"
+  ],
+  preset: "ts-jest",
+  moduleFileExtensions: ["ts", "js"]
 };