Inline regeneratorRuntime as a normal helper

Gulpfile.mjs

@@ -145,7 +145,14 @@ function generateTraverseHelpers(helperKind) {
   );
 }
 
-function generateRuntimeHelpers() {
+async function generateRuntimeHelpers() {
+  await generateHelpers(
+    `./packages/babel-helpers/scripts/generate-regenerator-runtime.js`,
+    `./packages/babel-helpers/src/helpers`,
+    "regeneratorRuntime.js",
+    "@babel/helpers -> regeneratorRuntime"
+  );
+
   return generateHelpers(
     `./packages/babel-helpers/scripts/generate-helpers.js`,
     `./packages/babel-helpers/src/`,
@@ -340,6 +347,7 @@ function buildRollup(packages, targetBrowsers) {
               include: [
                 /node_modules/,
                 "packages/babel-runtime/regenerator/**",
+                "packages/babel-runtime/helpers/*.js",
                 "packages/babel-preset-env/data/*.js",
                 // Rollup doesn't read export maps, so it loads the cjs fallback
                 "packages/babel-compat-data/*.js",
@@ -365,6 +373,7 @@ function buildRollup(packages, targetBrowsers) {
               babelHelpers: "bundled",
               extends: "./babel.config.js",
               extensions: [".ts", ".js", ".mjs", ".cjs"],
+              ignore: ["packages/babel-runtime/helpers/*.js"],
             }),
             rollupNodeResolve({
               extensions: [".ts", ".js", ".mjs", ".cjs", ".json"],
@@ -574,15 +583,12 @@ gulp.task(
   "build",
   gulp.series(
     "build-vendor",
-    gulp.parallel("build-rollup", "build-babel", "generate-runtime-helpers"),
-    gulp.parallel(
-      "generate-standalone",
-      gulp.series(
-        "generate-type-helpers",
-        // rebuild @babel/types since type-helpers may be changed
-        "build-babel"
-      )
-    )
+    gulp.parallel("build-rollup", "build-babel"),
+    gulp.parallel("generate-type-helpers", "generate-runtime-helpers"),
+    // rebuild @babel/types and @babel/helpers since
+    // type-helpers and generated helpers may be changed
+    "build-babel",
+    "generate-standalone"
   )
 );
 

Makefile

@@ -188,15 +188,16 @@ prepublish:
 	IS_PUBLISH=true $(MAKE) test
 
 new-version-checklist:
-	# @echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
-	# @echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
-	# @echo "!!!!!!                                                   !!!!!!"
-	# @echo "!!!!!!         Write any message that should             !!!!!!"
-	# @echo "!!!!!!            block the release here                 !!!!!!"
-	# @echo "!!!!!!                                                   !!!!!!"
-	# @echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
-	# @echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
-	# @exit 1
+	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+	@echo "!!!!!!                                                   !!!!!!"
+	@echo "!!!!!!   Update the regeneratorRuntime helper version    !!!!!!"
+	@echo "!!!!!!        in generate-regenerator-runtime.js         !!!!!!"
+	@echo "!!!!!!         and re-build the runtime helpers          !!!!!!"
+	@echo "!!!!!!                                                   !!!!!!"
+	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+	@exit 1
 
 new-version:
 	$(MAKE) new-version-checklist

packages/babel-core/test/fixtures/transformation/misc/regression-2892/output.js

@@ -13,9 +13,9 @@ var Foo = /*#__PURE__*/function () {
   babelHelpers.createClass(Foo, [{
     key: "bar",
     value: function () {
-      var _bar = babelHelpers.asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee() {
+      var _bar = babelHelpers.asyncToGenerator( /*#__PURE__*/babelHelpers.regeneratorRuntime().mark(function _callee() {
         var baz;
-        return regeneratorRuntime.wrap(function _callee$(_context) {
+        return babelHelpers.regeneratorRuntime().wrap(function _callee$(_context) {
           while (1) {
             switch (_context.prev = _context.next) {
               case 0:
@@ -46,17 +46,17 @@ function foo() {
 }
 
 function _foo() {
-  _foo = babelHelpers.asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee3() {
+  _foo = babelHelpers.asyncToGenerator( /*#__PURE__*/babelHelpers.regeneratorRuntime().mark(function _callee3() {
     var bar, _bar2;
 
-    return regeneratorRuntime.wrap(function _callee3$(_context3) {
+    return babelHelpers.regeneratorRuntime().wrap(function _callee3$(_context3) {
       while (1) {
         switch (_context3.prev = _context3.next) {
           case 0:
             _bar2 = function _bar4() {
-              _bar2 = babelHelpers.asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee2() {
+              _bar2 = babelHelpers.asyncToGenerator( /*#__PURE__*/babelHelpers.regeneratorRuntime().mark(function _callee2() {
                 var baz;
-                return regeneratorRuntime.wrap(function _callee2$(_context2) {
+                return babelHelpers.regeneratorRuntime().wrap(function _callee2$(_context2) {
                   while (1) {
                     switch (_context2.prev = _context2.next) {
                       case 0:

packages/babel-helper-transform-fixture-test-runner/package.json

@@ -20,8 +20,7 @@
     "@babel/helper-check-duplicate-nodes": "workspace:^",
     "@babel/helper-fixtures": "workspace:^",
     "@jridgewell/trace-mapping": "^0.3.8",
-    "quick-lru": "5.1.0",
-    "regenerator-runtime": "^0.13.7"
+    "quick-lru": "5.1.0"
   },
   "devDependencies": {
     "@types/jest": "^27.4.1"

packages/babel-helper-transform-fixture-test-runner/src/index.ts

@@ -55,15 +55,6 @@ function createContext() {
   const moduleCache = Object.create(null);
   contextModuleCache.set(context, moduleCache);
 
-  // Initialize the test context with the polyfill, and then freeze the global to prevent implicit
-  // global creation in tests, which could cause things to bleed between tests.
-  runModuleInTestContext(
-    "regenerator-runtime",
-    fileURLToPath(import.meta.url),
-    context,
-    moduleCache,
-  );
-
   // Populate the "babelHelpers" global with Babel's helper utilities.
   runCacheableScriptInTestContext(
     path.join(

packages/babel-helpers/package.json

@@ -20,7 +20,10 @@
     "@babel/types": "workspace:^"
   },
   "devDependencies": {
+    "@babel/generator": "workspace:^",
     "@babel/helper-plugin-test-runner": "workspace:^",
+    "@babel/parser": "workspace:^",
+    "regenerator-runtime": "^0.13.9",
     "terser": "^5.9.0"
   },
   "engines": {

packages/babel-helpers/scripts/generate-helpers.js

@@ -1,7 +1,7 @@
 import fs from "fs";
 import { join } from "path";
 import { URL, fileURLToPath } from "url";
-import { minify } from "terser"; // eslint-disable-line
+import { minify } from "terser"; // eslint-disable-line import/no-extraneous-dependencies
 
 const HELPERS_FOLDER = new URL("../src/helpers", import.meta.url);
 const IGNORED_FILES = new Set(["package.json"]);
@@ -17,7 +17,7 @@ import template from "@babel/template";
 function helper(minVersion, source) {
   return Object.freeze({
     minVersion,
-    ast: () => template.program.ast(source),
+    ast: () => template.program.ast(source, { preserveComments: true }),
   })
 }
 

packages/babel-helpers/scripts/generate-regenerator-runtime.js

@@ -0,0 +1,64 @@
+/* eslint-disable import/no-extraneous-dependencies */
+
+import fs from "fs";
+import { createRequire } from "module";
+
+const [parse, generate] = await Promise.all([
+  import("@babel/parser").then(ns => ns.parse),
+  import("@babel/generator").then(ns => ns.default.default),
+]).catch(error =>
+  Promise.reject(
+    new Error(
+      "Before running generate-helpers.js you must compile @babel/parser, @babel/generator and @babel/types.",
+      { cause: error }
+    )
+  )
+);
+
+const REGENERATOR_RUNTIME_IN_FILE = fs.readFileSync(
+  createRequire(import.meta.url).resolve("regenerator-runtime"),
+  "utf8"
+);
+
+const MIN_VERSION = "7.17.9";
+
+const HEADER = `/* @minVersion ${MIN_VERSION} */
+/*
+ * This file is auto-generated! Do not modify it directly.
+ * To re-generate, update the regenerator-runtime dependency of
+ * @babel/helpers and run 'yarn gulp generate-runtime-helpers'.
+ */
+
+/* eslint-disable */
+`;
+
+const COPYRIGHT = `/*! regenerator-runtime -- Copyright (c) 2014-present, Facebook, Inc. -- license (MIT): https://github.com/facebook/regenerator/blob/main/LICENSE */`;
+
+export default function generateRegeneratorRuntimeHelper() {
+  const ast = parse(REGENERATOR_RUNTIME_IN_FILE, { sourceType: "script" });
+
+  const factoryFunction = ast.program.body[0].declarations[0].init.callee;
+  factoryFunction.type = "FunctionDeclaration";
+  factoryFunction.id = { type: "Identifier", name: "_regeneratorRuntime" };
+  factoryFunction.params = [];
+  factoryFunction.body.body.unshift(
+    ...stmts(`
+    ${COPYRIGHT}
+    _regeneratorRuntime = function () { return exports; };
+    var exports = {};
+  `)
+  );
+
+  const { code } = generate({
+    type: "ExportDefaultDeclaration",
+    declaration: factoryFunction,
+  });
+
+  return HEADER + code;
+}
+
+function stmts(code) {
+  return parse(`function _() { ${code} }`, {
+    sourceType: "script",
+  }).program.body[0].body.body;
+}