Prepare repository for gradual flow->ts migration (#12317)

Co-authored-by: Bogdan Savluk <savluk.bogdan@gmail.com>

.eslintignore

@@ -9,6 +9,7 @@ packages/babel-runtime-corejs2
 packages/babel-runtime-corejs3
 packages/*/node_modules
 packages/*/lib
+packages/*/dts
 packages/*/dist
 packages/*/test/fixtures
 packages/*/test/tmp

.eslintrc.js

@@ -19,11 +19,24 @@ module.exports = {
     node: true,
   },
   overrides: [
+    {
+      files: ["**/*.ts"],
+      parser: "@typescript-eslint/parser",
+      plugins: ["@typescript-eslint"],
+      rules: {
+        "no-unused-vars": "off",
+        "@typescript-eslint/no-unused-vars": "error",
+        "no-dupe-class-members": "off",
+        "@typescript-eslint/no-dupe-class-members": "error",
+        "no-undef": "off",
+        "no-redeclare": "off",
+      },
+    },
     {
       files: [
-        "packages/*/src/**/*.js",
+        "packages/*/src/**/*.{js,ts}",
-        "codemods/*/src/**/*.js",
+        "codemods/*/src/**/*.{js,ts}",
-        "eslint/*/src/**/*.js",
+        "eslint/*/src/**/*.{js,ts}",
       ],
       rules: {
         "@babel/development/no-undefined-identifier": "error",
@@ -37,7 +50,7 @@ module.exports = {
         "packages/*/test/**/*.js",
         "codemods/*/test/**/*.js",
         "eslint/*/test/**/*.js",
-        "packages/babel-helper-transform-fixture-test-runner/src/helpers.js",
+        "packages/babel-helper-transform-fixture-test-runner/src/helpers.{ts,js}",
         "test/**/*.js",
       ],
       env: {
@@ -53,7 +66,7 @@ module.exports = {
       },
     },
     {
-      files: ["packages/babel-plugin-*/src/index.js"],
+      files: ["packages/babel-plugin-*/src/index.{js,ts}"],
       excludedFiles: ["packages/babel-plugin-transform-regenerator/**/*.js"],
       rules: {
         "@babel/development/plugin-name": "error",
@@ -61,7 +74,7 @@ module.exports = {
       },
     },
     {
-      files: ["packages/babel-parser/src/**/*.js"],
+      files: ["packages/babel-parser/src/**/*.{js,ts}"],
       rules: {
         "@babel/development-internal/dry-error-messages": [
           "error",

.flowconfig

@@ -16,6 +16,7 @@ lib/parser.js
 lib/third-party-libs.js.flow
 lib/preset-modules.js.flow
 packages/babel-types/lib/index.js.flow
+lib/babel-packages.js.flow
 
 [options]
 include_warnings=true

.gitignore

@@ -70,3 +70,10 @@ packages/babel-standalone/babel.min.js
 /eslint/*/LICENSE
 !/packages/babel-eslint-plugin/LICENSE
 /.vscode
+
+/tsconfig.json
+/packages/*/tsconfig.json
+/packages/*/tsconfig.tsbuildinfo
+/packages/*/dts
+/codemods/*/dts
+/eslint/*/dts

.prettierrc

@@ -10,15 +10,14 @@
   "printWidth": 80,
   "overrides": [{
     "files": [
-      "**/codemods/*/src/**/*.js",
+      "**/codemods/*/src/**/*.{js,ts}",
       "**/codemods/*/test/**/*.js",
-      "**/packages/*/src/**/*.js",
+      "**/packages/*/src/**/*.{js,ts}",
       "**/packages/*/test/**/*.js",
-      "**/eslint/*/src/**/*.js",
+      "**/eslint/*/src/**/*.{js,ts}",
       "**/eslint/*/test/**/*.js"
     ],
     "options": {
-      "parser": "babel",
       "trailingComma": "all"
     }
   }]

Gulpfile.js

@@ -9,6 +9,7 @@ const fancyLog = require("fancy-log");
 const filter = require("gulp-filter");
 const gulp = require("gulp");
 const path = require("path");
+const fs = require("fs");
 const rollup = require("rollup");
 const rollupBabel = require("@rollup/plugin-babel").default;
 const rollupBabelSource = require("./scripts/rollup-plugin-babel-source");
@@ -19,7 +20,7 @@ const rollupNodeResolve = require("@rollup/plugin-node-resolve").default;
 const rollupReplace = require("@rollup/plugin-replace");
 const { terser: rollupTerser } = require("rollup-plugin-terser");
 
-const defaultSourcesGlob = "./@(codemods|packages|eslint)/*/src/**/*.js";
+const defaultSourcesGlob = "./@(codemods|packages|eslint)/*/src/**/*.{js,ts}";
 
 function swapSrcWithLib(srcPath) {
   const parts = srcPath.split(path.sep);
@@ -28,7 +29,12 @@ function swapSrcWithLib(srcPath) {
 }
 
 function getIndexFromPackage(name) {
-  return `${name}/src/index.js`;
+  try {
+    fs.statSync(`./${name}/src/index.ts`);
+    return `${name}/src/index.ts`;
+  } catch {
+    return `${name}/src/index.js`;
+  }
 }
 
 function compilationLogger() {
@@ -121,8 +127,10 @@ function buildRollup(packages) {
             babelrc: false,
             babelHelpers: "bundled",
             extends: "./babel.config.js",
+            extensions: [".mjs", ".cjs", ".ts", ".js"],
           }),
           rollupNodeResolve({
+            extensions: [".mjs", ".cjs", ".ts", ".js", ".json"],
             browser: nodeResolveBrowser,
             preferBuiltins: true,
             //todo: remove when semver and source-map are bumped to latest versions
@@ -142,7 +150,7 @@ function buildRollup(packages) {
           rollupJson(),
           rollupNodePolyfills({
             sourceMap: sourcemap,
-            include: "**/*.js",
+            include: "**/*.{js,ts}",
           }),
         ],
       });

Makefile

@@ -36,6 +36,9 @@ build-bundle: clean clean-lib
 build-bundle-ci: bootstrap-only
 	$(MAKE) build-bundle
 
+generate-tsconfig:
+	$(NODE) scripts/generators/tsconfig.js
+
 generate-standalone:
 	$(NODE) packages/babel-standalone/scripts/generate.js
 
@@ -86,12 +89,16 @@ watch: build-no-bundle
 	BABEL_ENV=development $(YARN) gulp watch
 
 code-quality-ci: build-no-bundle-ci
-	$(MAKE) flowcheck-ci lint-ci
+	$(MAKE) tscheck flowcheck-ci lint-ci
 
 flowcheck-ci:
 	$(MAKE) flow
 
-code-quality: flow lint
+code-quality: tscheck flow lint
+
+tscheck: generate-tsconfig
+	make build-typescript-typings
+	$(YARN) tsc -b .
 
 flow:
 	$(YARN) flow check --strip-root
@@ -110,7 +117,7 @@ check-compat-data-ci:
 lint: lint-js lint-ts
 
 lint-js:
-	BABEL_ENV=test $(YARN) eslint scripts $(SOURCES) '*.js' --format=codeframe
+	BABEL_ENV=test $(YARN) eslint scripts $(SOURCES) '*.{js,ts}' --format=codeframe --ext .js,.cjs,.mjs,.ts
 
 lint-ts:
 	scripts/lint-ts-typings.sh
@@ -118,7 +125,7 @@ lint-ts:
 fix: fix-json fix-js
 
 fix-js:
-	$(YARN) eslint scripts $(SOURCES) '*.js' --format=codeframe --fix
+	$(YARN) eslint scripts $(SOURCES) '*.{js,ts}' --format=codeframe --ext .js,.cjs,.mjs,.ts --fix
 
 fix-json:
 	$(YARN) prettier "{$(COMMA_SEPARATED_SOURCES)}/*/test/fixtures/**/options.json" --write --loglevel warn
@@ -137,6 +144,10 @@ clean: test-clean
 	rm -rf packages/*/npm-debug*
 	rm -rf node_modules/.cache
 
+clean-tsconfig:
+	rm -f tsconfig.json
+	rm -f packages/*/tsconfig.json
+
 test-clean:
 	$(foreach source, $(SOURCES), \
 		$(call clean-source-test, $(source)))
@@ -212,6 +223,8 @@ clone-license:
 prepublish-build: clean-lib clean-runtime-helpers
 	NODE_ENV=production BABEL_ENV=production $(MAKE) build-bundle
 	$(MAKE) prepublish-build-standalone clone-license
+	# We don't want to publish .d.ts files yet
+	rm -rf packages/*/dts
 
 prepublish:
 	$(MAKE) check-yarn-bug-1882
@@ -272,7 +285,7 @@ clean-runtime-helpers:
 	rm -f packages/babel-runtime-corejs3/helpers/**/*.js
 	rm -rf packages/babel-runtime-corejs2/core-js
 
-clean-all:
+clean-all: clean-tsconfig
 	rm -rf node_modules
 	rm -rf package-lock.json
 	rm -rf .changelog

babel.config.js

@@ -103,6 +103,10 @@ module.exports = function (api) {
       .filter(Boolean)
       .map(normalize),
     presets: [
+      [
+        "@babel/preset-typescript",
+        { onlyRemoveTypeImports: true, allowDeclareFields: true },
+      ],
       ["@babel/env", envOpts],
       ["@babel/preset-flow", { allowDeclareFields: true }],
     ],

package.json

@@ -27,6 +27,7 @@
     "@babel/plugin-transform-runtime": "^7.12.0",
     "@babel/preset-env": "^7.12.0",
     "@babel/preset-flow": "^7.10.4",
+    "@babel/preset-typescript": "^7.12.1",
     "@babel/register": "^7.12.0",
     "@babel/runtime": "^7.12.0",
     "@rollup/plugin-babel": "^5.2.0",
@@ -34,6 +35,8 @@
     "@rollup/plugin-json": "^4.1.0",
     "@rollup/plugin-node-resolve": "^9.0.0",
     "@rollup/plugin-replace": "^2.3.3",
+    "@typescript-eslint/eslint-plugin": "^4.6.1",
+    "@typescript-eslint/parser": "^4.6.1",
     "babel-plugin-transform-charcodes": "^0.2.0",
     "chalk": "^2.4.2",
     "charcodes": "^0.2.0",
@@ -61,7 +64,7 @@
     "rollup-plugin-terser": "^7.0.0",
     "test262-stream": "^1.3.0",
     "through2": "^2.0.0",
-    "typescript": "^3.6.3"
+    "typescript": "^4.0.5"
   },
   "workspaces": [
     "codemods/*",
@@ -78,7 +81,7 @@
     "yarn": ">=1.4.0"
   },
   "lint-staged": {
-    "*.js": [
+    "*.{js,ts}": [
       "eslint --format=codeframe"
     ]
   },

packages/babel-parser/typings/babel-parser.d.ts

@@ -8,144 +8,150 @@
 /**
  * Parse the provided code as an entire ECMAScript program.
  */
-export function parse(input: string, options?: ParserOptions): import('@babel/types').File;
+export function parse(
+  input: string,
+  options?: ParserOptions
+): import("@babel/types").File;
 
 /**
  * Parse the provided code as a single expression.
  */
-export function parseExpression(input: string, options?: ParserOptions): import('@babel/types').Expression;
+export function parseExpression(
+  input: string,
+  options?: ParserOptions
+): import("@babel/types").Expression;
 
 export interface ParserOptions {
-    /**
+  /**
-     * By default, import and export declarations can only appear at a program's top level.
+   * By default, import and export declarations can only appear at a program's top level.
-     * Setting this option to true allows them anywhere where a statement is allowed.
+   * Setting this option to true allows them anywhere where a statement is allowed.
-     */
+   */
-    allowImportExportEverywhere?: boolean;
+  allowImportExportEverywhere?: boolean;
 
-    /**
+  /**
-     * By default, await use is not allowed outside of an async function.
+   * By default, await use is not allowed outside of an async function.
-     * Set this to true to accept such code.
+   * Set this to true to accept such code.
-     */
+   */
-    allowAwaitOutsideFunction?: boolean;
+  allowAwaitOutsideFunction?: boolean;
 
-    /**
+  /**
-     * By default, a return statement at the top level raises an error.
+   * By default, a return statement at the top level raises an error.
-     * Set this to true to accept such code.
+   * Set this to true to accept such code.
-     */
+   */
-    allowReturnOutsideFunction?: boolean;
+  allowReturnOutsideFunction?: boolean;
 
-    allowSuperOutsideMethod?: boolean;
+  allowSuperOutsideMethod?: boolean;
 
-    /**
+  /**
-     * By default, exported identifiers must refer to a declared variable.
+   * By default, exported identifiers must refer to a declared variable.
-     * Set this to true to allow export statements to reference undeclared variables.
+   * Set this to true to allow export statements to reference undeclared variables.
-     */
+   */
-    allowUndeclaredExports?: boolean;
+  allowUndeclaredExports?: boolean;
 
-    /**
+  /**
-     * Indicate the mode the code should be parsed in.
+   * Indicate the mode the code should be parsed in.
-     * Can be one of "script", "module", or "unambiguous". Defaults to "script".
+   * Can be one of "script", "module", or "unambiguous". Defaults to "script".
-     * "unambiguous" will make @babel/parser attempt to guess, based on the presence
+   * "unambiguous" will make @babel/parser attempt to guess, based on the presence
-     * of ES6 import or export statements.
+   * of ES6 import or export statements.
-     * Files with ES6 imports and exports are considered "module" and are otherwise "script".
+   * Files with ES6 imports and exports are considered "module" and are otherwise "script".
-     */
+   */
-    sourceType?: 'script' | 'module' | 'unambiguous';
+  sourceType?: "script" | "module" | "unambiguous";
 
-    /**
+  /**
-     * Correlate output AST nodes with their source filename.
+   * Correlate output AST nodes with their source filename.
-     * Useful when generating code and source maps from the ASTs of multiple input files.
+   * Useful when generating code and source maps from the ASTs of multiple input files.
-     */
+   */
-    sourceFilename?: string;
+  sourceFilename?: string;
 
-    /**
+  /**
-     * By default, the first line of code parsed is treated as line 1.
+   * By default, the first line of code parsed is treated as line 1.
-     * You can provide a line number to alternatively start with.
+   * You can provide a line number to alternatively start with.
-     * Useful for integration with other source tools.
+   * Useful for integration with other source tools.
-     */
+   */
-    startLine?: number;
+  startLine?: number;
 
-    /**
+  /**
-     * Array containing the plugins that you want to enable.
+   * Array containing the plugins that you want to enable.
-     */
+   */
-    plugins?: ParserPlugin[];
+  plugins?: ParserPlugin[];
 
-    /**
+  /**
-     * Should the parser work in strict mode.
+   * Should the parser work in strict mode.
-     * Defaults to true if sourceType === 'module'. Otherwise, false.
+   * Defaults to true if sourceType === 'module'. Otherwise, false.
-     */
+   */
-    strictMode?: boolean;
+  strictMode?: boolean;
 
-    /**
+  /**
-     * Adds a ranges property to each node: [node.start, node.end]
+   * Adds a ranges property to each node: [node.start, node.end]
-     */
+   */
-    ranges?: boolean;
+  ranges?: boolean;
 
-    /**
+  /**
-     * Adds all parsed tokens to a tokens property on the File node.
+   * Adds all parsed tokens to a tokens property on the File node.
-     */
+   */
-    tokens?: boolean;
+  tokens?: boolean;
 
-    /**
+  /**
-     * By default, the parser adds information about parentheses by setting
+   * By default, the parser adds information about parentheses by setting
-     * `extra.parenthesized` to `true` as needed.
+   * `extra.parenthesized` to `true` as needed.
-     * When this option is `true` the parser creates `ParenthesizedExpression`
+   * When this option is `true` the parser creates `ParenthesizedExpression`
-     * AST nodes instead of using the `extra` property.
+   * AST nodes instead of using the `extra` property.
-     */
+   */
-    createParenthesizedExpressions?: boolean;
+  createParenthesizedExpressions?: boolean;
 }
 
 export type ParserPlugin =
-    'asyncGenerators' |
+  | "asyncGenerators"
-    'bigInt' |
+  | "bigInt"
-    'classPrivateMethods' |
+  | "classPrivateMethods"
-    'classPrivateProperties' |
+  | "classPrivateProperties"
-    'classProperties' |
+  | "classProperties"
-    'classStaticBlock' |
+  | "classStaticBlock"
-    'decimal' |
+  | "decimal"
-    'decorators' |
+  | "decorators"
-    'decorators-legacy' |
+  | "decorators-legacy"
-    'doExpressions' |
+  | "doExpressions"
-    'dynamicImport' |
+  | "dynamicImport"
-    'estree' |
+  | "estree"
-    'exportDefaultFrom' |
+  | "exportDefaultFrom"
-    'exportNamespaceFrom' | // deprecated
+  | "exportNamespaceFrom" // deprecated
-    'flow' |
+  | "flow"
-    'flowComments' |
+  | "flowComments"
-    'functionBind' |
+  | "functionBind"
-    'functionSent' |
+  | "functionSent"
-    'importMeta' |
+  | "importMeta"
-    'jsx' |
+  | "jsx"
-    'logicalAssignment' |
+  | "logicalAssignment"
-    'importAssertions' |
+  | "importAssertions"
-    'moduleStringNames' |
+  | "moduleStringNames"
-    'nullishCoalescingOperator' |
+  | "nullishCoalescingOperator"
-    'numericSeparator' |
+  | "numericSeparator"
-    'objectRestSpread' |
+  | "objectRestSpread"
-    'optionalCatchBinding' |
+  | "optionalCatchBinding"
-    'optionalChaining' |
+  | "optionalChaining"
-    'partialApplication' |
+  | "partialApplication"
-    'pipelineOperator' |
+  | "pipelineOperator"
-    'placeholders' |
+  | "placeholders"
-    'privateIn' |
+  | "privateIn"
-    'throwExpressions' |
+  | "throwExpressions"
-    'topLevelAwait' |
+  | "topLevelAwait"
-    'typescript' |
+  | "typescript"
-    'v8intrinsic' |
+  | "v8intrinsic"
-    ParserPluginWithOptions;
+  | ParserPluginWithOptions;
 
 export type ParserPluginWithOptions =
-    ['decorators', DecoratorsPluginOptions] |
+  | ["decorators", DecoratorsPluginOptions]
-    ['pipelineOperator', PipelineOperatorPluginOptions] |
+  | ["pipelineOperator", PipelineOperatorPluginOptions]
-    ['flow', FlowPluginOptions];
+  | ["flow", FlowPluginOptions];
 
 export interface DecoratorsPluginOptions {
-    decoratorsBeforeExport?: boolean;
+  decoratorsBeforeExport?: boolean;
 }
 
 export interface PipelineOperatorPluginOptions {
-    proposal: 'minimal' | 'smart';
+  proposal: "minimal" | "smart";
 }
 
 export interface FlowPluginOptions {
-    all?: boolean;
+  all?: boolean;
 }

scripts/generators/tsconfig.js

@@ -0,0 +1,71 @@
+"use strict";
+
+const path = require("path");
+const fs = require("fs");
+
+const root = path.resolve(__dirname, "../../");
+
+const tsPkgs = fs
+  .readdirSync(path.join(root, "packages"))
+  .filter(name => name.startsWith("babel-"))
+  .map(name => ({
+    name: name.replace(/^babel-/, "@babel/"),
+    dir: path.resolve(root, "packages", name),
+  }))
+  .filter(({ dir }) => {
+    try {
+      fs.statSync(path.join(dir, "src", "index.ts"));
+      return true;
+    } catch {
+      return false;
+    }
+  });
+
+for (const { dir } of tsPkgs) {
+  const pkg = require(`${dir}/package.json`);
+
+  const references = [];
+  for (const dep of Object.keys(pkg.dependencies)) {
+    if (!dep.startsWith("@babel/")) continue;
+    for (const { name, dir: depDir } of tsPkgs) {
+      if (name === dep) {
+        references.push({ path: path.relative(dir, depDir) });
+        break;
+      }
+    }
+  }
+
+  fs.writeFileSync(
+    path.resolve(dir, "tsconfig.json"),
+    JSON.stringify(
+      {
+        extends: "../../tsconfig.base.json",
+        compilerOptions: {
+          // Until we have converted every package, we cannot store
+          // .d.ts files inside lib/ because it causes conflicts
+          // with Babel-related type definitions in node_modules/@types
+          outDir: "./dts",
+          rootDir: "./src",
+        },
+        include: ["./src/**/*"],
+        references,
+      },
+      null,
+      2
+    )
+  );
+}
+
+fs.writeFileSync(
+  path.resolve(root, `tsconfig.json`),
+  JSON.stringify(
+    {
+      files: [],
+      references: tsPkgs.map(({ dir }) => ({
+        path: path.relative(root, dir),
+      })),
+    },
+    null,
+    2
+  )
+);

scripts/rollup-plugin-babel-source.js

@@ -81,13 +81,21 @@ module.exports = function () {
           ? packageJson["browser"]
           : packageJson["main"];
 
-      return path.normalize(
+      const asJS = path.normalize(
         path.join(
           packageFolder,
           // replace lib with src in the package.json entry
           filename.replace(/^(\.\/)?lib\//, "src/")
         )
       );
+      const asTS = asJS.replace(/\.js$/, ".ts");
+
+      try {
+        fs.statSync(asTS);
+        return asTS;
+      } catch {
+        return asJS;
+      }
     },
   };
 };

tsconfig.base.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "esnext",
+    "module": "esnext",
+    "lib": [
+      "esnext"
+    ],
+    "emitDeclarationOnly": true,
+    "composite": true,
+    "moduleResolution": "node",
+    "esModuleInterop": true,
+    "isolatedModules": true,
+    "skipLibCheck": true,
+    "resolveJsonModule": true
+  }
+}

yarn.lock

@@ -233,14 +233,14 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@babel/generator@npm:^7.12.0":
+"@babel/generator@npm:^7.12.0, @babel/generator@npm:^7.12.5":
-  version: 7.12.0
+  version: 7.12.5
-  resolution: "@babel/generator@npm:7.12.0"
+  resolution: "@babel/generator@npm:7.12.5"
   dependencies:
-    "@babel/types": ^7.12.0
+    "@babel/types": ^7.12.5
     jsesc: ^2.5.1
     source-map: ^0.5.0
-  checksum: e3aa0dfbe91cac7f21e796969a37effeb63006f66e568e90d371fc3592c47c9430f2afc6f14a53657798e401c99f9335470ee4fa1001ea7778232f613961ab97
+  checksum: 7706cb3d29060e6dfcdbc982ded9a02f0bda36329cc35aabc6b3f9f30ef7b3b3bcaba51c24714663f3ea9529994cd3461ab8a664b26398208b9b9a96476bf43c
   languageName: node
   linkType: hard
 
@@ -358,19 +358,18 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@babel/helper-create-class-features-plugin@npm:^7.10.4":
+"@babel/helper-create-class-features-plugin@npm:^7.10.4, @babel/helper-create-class-features-plugin@npm:^7.12.1":
-  version: 7.10.5
+  version: 7.12.1
-  resolution: "@babel/helper-create-class-features-plugin@npm:7.10.5"
+  resolution: "@babel/helper-create-class-features-plugin@npm:7.12.1"
   dependencies:
     "@babel/helper-function-name": ^7.10.4
-    "@babel/helper-member-expression-to-functions": ^7.10.5
+    "@babel/helper-member-expression-to-functions": ^7.12.1
     "@babel/helper-optimise-call-expression": ^7.10.4
-    "@babel/helper-plugin-utils": ^7.10.4
+    "@babel/helper-replace-supers": ^7.12.1
-    "@babel/helper-replace-supers": ^7.10.4
     "@babel/helper-split-export-declaration": ^7.10.4
   peerDependencies:
     "@babel/core": ^7.0.0
-  checksum: ba8fb0f7b7788d0fde2341314a86d0d5705ed17537eba1e319bb0e532125c5b97fc142633ae1605615be9f45cb6cbf19879c13e626610ecd3be1821d651a1423
+  checksum: d686eae70dc985b5e0dae85b7ec690930939b564be7f2c09ca2838a52f562f5753fa5d8a12f7305303597f9f8658d51cb36ec71e6e234b1d1385a36c632ea61f
   languageName: node
   linkType: hard
 
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     tsserver: bin/tsserver
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