Fix compatibility with Node.js 20.6

.circleci/config.yml

@@ -24,7 +24,7 @@ aliases:
 executors:
   node-executor:
     docker:
-      - image: cimg/node:20.5
+      - image: cimg/node:current
     working_directory: ~/babel
 
 jobs:

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: 'Check or update Yarn cache (fix w/ "yarn install")'
@@ -39,7 +39,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: 'Check for unmet constraints (fix w/ "yarn constraints --fix")'
@@ -68,7 +68,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Generate coverage report
@@ -90,7 +90,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Use ESM and build
@@ -117,7 +117,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Build babel artifacts
@@ -157,7 +157,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Build babel artifacts
@@ -182,7 +182,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Install
@@ -212,7 +212,7 @@ jobs:
       - name: Use Node.js latest # Run yarn on latest node
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Install
@@ -256,7 +256,7 @@ jobs:
         if: matrix.node-version == '6' || matrix.node-version == '8' || matrix.node-version == '10'
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
 
   build-babel8:
     name: Build Babel 8 Artifacts
@@ -271,7 +271,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Use ESM
@@ -343,7 +343,7 @@ jobs:
       - name: Use Node.js 18
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Install
@@ -369,7 +369,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Install
@@ -398,7 +398,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       # See https://github.com/babel/babel/pull/12906
@@ -504,7 +504,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
           cache: "yarn"
       - name: Install
@@ -529,7 +529,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
       - name: Checkout test runner
         uses: actions/checkout@v4
@@ -566,7 +566,7 @@ jobs:
       - name: Use Node.js latest
         uses: actions/setup-node@v3
         with:
-          node-version: 20.5.x
+          node-version: latest
           check-latest: true
       - name: Install
         run: yarn install

babel.config.js

@@ -303,6 +303,15 @@ module.exports = function (api) {
         ].map(normalize),
         plugins: [pluginImportMetaUrl],
       },
+      // See comment in the plugin
+      convertESM && {
+        test: [
+          "./packages/babel-core/src/index.ts",
+          "./packages/babel-types/src/index.ts",
+          "./packages/babel-traverse/src/index.ts",
+        ],
+        plugins: [pluginInjectErrorBugNode_20_6_0],
+      },
       {
         test: sources.map(source => normalize(source.replace("/src", "/test"))),
         plugins: [
@@ -954,3 +963,45 @@ function pluginReplaceNavigator({ template }) {
     },
   };
 }
+
+// Workaround for https://github.com/nodejs/node/issues/49497, since
+// Node.js is taking ages to release the fix.
+// This bug only affects CJS packages that are imported from ESM. We only apply
+// it to packages that have cycles in their entrypoint. They can be easily
+// caught by our CI in ESM mode on Node.js 20.6.0:
+// - @babel/core
+// - @babel/types
+// - @babel/traverse
+//
+// We will remove this workaround after one week that Node.js 20.6.1 has been
+// released, so that all CIs using `node:latest` will be using the new version.
+function pluginInjectErrorBugNode_20_6_0({ template }) {
+  const flag = "___internal__alreadyRunning";
+
+  return {
+    post({ path }) {
+      path.unshiftContainer(
+        "body",
+        // We use `"${flag}" + ""` so that the Node.js ESM-CJS
+        // integration does not detect it as an export.
+        template.statement.ast`
+          if (typeof process === "object" && process.version === "v20.6.0") {
+            if (exports["${flag}" + ""]) return;
+            Object.defineProperty(exports, "${flag}", {
+              value: true,
+              enumerable: false,
+              configurable: true,
+            });
+          }
+        `
+      );
+      path.pushContainer(
+        "body",
+        template.statement.ast`
+          if (typeof process === "object" && process.version === "v20.6.0")
+            delete exports["${flag}" + ""];
+          `
+      );
+    },
+  };
+}

jest.config.js

@@ -60,6 +60,11 @@ module.exports = {
     ...(process.env.BABEL_COVERAGE === "true"
       ? ["<rootDir>/packages/babel-standalone/"]
       : []),
+    // Node.js 20.6.0 has a bug that causes importing all previous Babel
+    // versions to fail. This test relies on Babel 7.12, so let's skip it.
+    ...(process.version === "v20.6.0"
+      ? ["/babel-preset-env/test/regressions.js"]
+      : []),
   ],
   testEnvironment: "node",
   transformIgnorePatterns: [

packages/babel-core/src/config/files/plugins.ts

@@ -9,7 +9,7 @@ import { isAsync } from "../../gensync-utils/async.ts";
 import loadCodeDefault, { supportsESM } from "./module-types.ts";
 import { fileURLToPath, pathToFileURL } from "url";
 
-import importMetaResolve from "./import-meta-resolve.ts";
+import { resolve as importMetaResolve } from "../../vendor/import-meta-resolve.ts";
 
 import { createRequire } from "module";
 const require = createRequire(import.meta.url);
@@ -146,8 +146,8 @@ function tryRequireResolve(
 }
 
 function tryImportMetaResolve(
-  id: Parameters<ImportMeta["resolve"]>[0],
-  options: Parameters<ImportMeta["resolve"]>[1],
+  id: Parameters<typeof importMetaResolve>[0],
+  options: Parameters<typeof importMetaResolve>[1],
 ): Result<string> {
   try {
     return { error: null, value: importMetaResolve(id, options) };