[babel 8] Fix @babel/compat-data package.json

Gulpfile.mjs

@@ -419,6 +419,21 @@ function buildRollup(packages, buildStandalone) {
                 "packages/babel-compat-data/scripts/data/legacy-plugin-aliases.js",
                 "packages/*/src/**/*.cjs",
               ],
+              ignore:
+                process.env.STRIP_BABEL_8_FLAG &&
+                bool(process.env.BABEL_8_BREAKING)
+                  ? [
+                      // These require()s are all in babel-preset-env/src/polyfills/babel-7-plugins.cjs
+                      // They are gated by a !process.env.BABEL_8_BREAKING check, but
+                      // @rollup/plugin-commonjs extracts them to import statements outside of the
+                      // check and thus they end up in the final bundle.
+                      "babel-plugin-polyfill-corejs2",
+                      "babel-plugin-polyfill-regenerator",
+                      "./babel-polyfill.cjs",
+                      "./regenerator.cjs",
+                      "@babel/compat-data/corejs2-built-ins",
+                    ]
+                  : [],
               dynamicRequireTargets: [
                 // https://github.com/mathiasbynens/regexpu-core/blob/ffd8fff2e31f4597f6fdfee75d5ac1c5c8111ec3/rewrite-pattern.js#L48
                 resolveChain(

packages/babel-compat-data/package.json

@@ -15,10 +15,12 @@
   "conditions": {
     "BABEL_8_BREAKING": [
       {
-        "./plugins": "./plugins.js",
-        "./native-modules": "./native-modules.js",
-        "./overlapping-plugins": "./overlapping-plugins.js",
-        "./plugin-bugfixes": "./plugin-bugfixes.js",
+        "exports": {
+          "./plugins": "./plugins.js",
+          "./native-modules": "./native-modules.js",
+          "./overlapping-plugins": "./overlapping-plugins.js",
+          "./plugin-bugfixes": "./plugin-bugfixes.js"
+        },
         "engines": {
           "node": "^16.20.0 || ^18.16.0 || >=20.0.0"
         }

packages/babel-plugin-transform-object-rest-spread/package.json

@@ -17,7 +17,6 @@
     "babel-plugin"
   ],
   "dependencies": {
-    "@babel/compat-data": "workspace:^",
     "@babel/helper-compilation-targets": "workspace:^",
     "@babel/helper-plugin-utils": "workspace:^",
     "@babel/plugin-syntax-object-rest-spread": "condition:BABEL_8_BREAKING ? : ^7.8.3",

packages/babel-plugin-transform-object-rest-spread/src/compat-data.ts

@@ -0,0 +1,15 @@
+export default {
+  "Object.assign": {
+    chrome: "49",
+    opera: "36",
+    edge: "13",
+    firefox: "36",
+    safari: "10",
+    node: "6",
+    deno: "1",
+    ios: "10",
+    samsung: "5",
+    opera_mobile: "36",
+    electron: "0.37",
+  },
+};

packages/babel-plugin-transform-object-rest-spread/src/index.ts

@@ -4,8 +4,8 @@ import type { PluginPass } from "@babel/core";
 import type { NodePath, Scope } from "@babel/traverse";
 import { convertFunctionParams } from "@babel/plugin-transform-parameters";
 import { isRequired } from "@babel/helper-compilation-targets";
-import compatData from "@babel/compat-data/corejs2-built-ins";
 import shouldStoreRHSInTemporaryVariable from "./shouldStoreRHSInTemporaryVariable.ts";
+import compatData from "./compat-data.ts";
 
 const { isAssignmentPattern, isObjectProperty } = t;
 // @babel/types <=7.3.3 counts FOO as referenced in var { x: FOO }.
@@ -33,7 +33,7 @@ export default declare((api, opts: Options) => {
   );
 
   const targets = api.targets();
-  const supportsObjectAssign = !isRequired("es6.object.assign", targets, {
+  const supportsObjectAssign = !isRequired("Object.assign", targets, {
     compatData,
   });
 

packages/babel-preset-env/src/normalize-options.ts

@@ -1,5 +1,4 @@
 import semver, { type SemVer } from "semver";
-import corejs2Polyfills from "@babel/compat-data/corejs2-built-ins";
 // @ts-expect-error Fixme: TS can not infer types from ../data/core-js-compat.js
 // but we can't import core-js-compat/data.json because JSON imports do
 // not work on Node 14
@@ -13,11 +12,8 @@ import {
 } from "./options.ts";
 import { OptionValidator } from "@babel/helper-validator-option";
 
-const corejs2DefaultWebIncludes = [
-  "web.timers",
-  "web.immediate",
-  "web.dom.iterable",
-];
+// TODO(Babel 8): Remove this
+import babel7 from "./polyfills/babel-7-plugins.cjs";
 
 import type {
   BuiltInsOption,
@@ -46,15 +42,11 @@ const getValidIncludesAndExcludes = (
   const set = new Set(allPluginsList);
   if (type === "exclude") modulePlugins.map(set.add, set);
   if (corejs) {
-    if (process.env.BABEL_8_BREAKING) {
-      Object.keys(corejs3Polyfills).map(set.add, set);
+    if (!process.env.BABEL_8_BREAKING && corejs === 2) {
+      Object.keys(babel7.corejs2Polyfills).map(set.add, set);
+      set.add("web.timers").add("web.immediate").add("web.dom.iterable");
     } else {
-      if (corejs === 2) {
-        Object.keys(corejs2Polyfills).map(set.add, set);
-        corejs2DefaultWebIncludes.map(set.add, set);
-      } else {
-        Object.keys(corejs3Polyfills).map(set.add, set);
-      }
+      Object.keys(corejs3Polyfills).map(set.add, set);
     }
   }
   return Array.from(set);

packages/babel-preset-env/src/polyfills/babel-7-plugins.cjs

@@ -10,5 +10,8 @@ if (!process.env.BABEL_8_BREAKING) {
     },
     legacyBabelPolyfillPlugin: { get: () => require("./babel-polyfill.cjs") },
     removeRegeneratorEntryPlugin: { get: () => require("./regenerator.cjs") },
+    corejs2Polyfills: {
+      get: () => require("@babel/compat-data/corejs2-built-ins"),
+    },
   });
 }

packages/babel-preset-env/src/polyfills/babel-7-plugins.d.cts

@@ -2,3 +2,4 @@ export const pluginCoreJS2: any;
 export const pluginRegenerator: any;
 export const legacyBabelPolyfillPlugin: any;
 export const removeRegeneratorEntryPlugin: any;
+export const corejs2Polyfills: any;

tsconfig.json

@@ -183,12 +183,6 @@
       "@babel/compat-data/native-modules": [
         "./packages/babel-compat-data/data/native-modules.json"
       ],
-      "@babel/compat-data/corejs2-built-ins": [
-        "./packages/babel-compat-data/data/corejs2-built-ins.json"
-      ],
-      "@babel/compat-data/corejs3-shipped-proposals": [
-        "./packages/babel-compat-data/data/corejs3-shipped-proposals.json"
-      ],
       "@babel/compat-data/overlapping-plugins": [
         "./packages/babel-compat-data/data/overlapping-plugins.json"
       ],

yarn.lock

@@ -3171,7 +3171,6 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@babel/plugin-transform-object-rest-spread@workspace:packages/babel-plugin-transform-object-rest-spread"
   dependencies:
-    "@babel/compat-data": "workspace:^"
     "@babel/core": "workspace:^"
     "@babel/helper-compilation-targets": "workspace:^"
     "@babel/helper-plugin-test-runner": "workspace:^"