Make tests work

Author: nicolo-ribaudo

jest.config.mjs

@@ -23,7 +23,6 @@ export default {
     '!**/vendor/**',
     '!e2e/**',
   ],
-  globalSetup: './jest.globalSetup.mjs',
   modulePathIgnorePatterns: [
     'examples/.*',
     'packages/.*/build',

jest.globalSetup.mjs

@@ -9,18 +9,15 @@ import type {TransformOptions as BabelTransformOptions} from '@babel/core';
 import type {SyncTransformer, TransformOptions} from '@jest/transform';
 import babelJest from '../index';
 
-// This is loaded by /jest.globalSetup.mjs. We need to pre-load it there
-// because this test file is being transpiled, leading to require(esm), which
-// we don't support yet.
-declare global {
-  // We need to use `var` to declare a global variable
-  // eslint-disable-next-line no-var
-  var preloadedDependencies: {
-    'babel-jest': {
-      '@babel-8/core': null | typeof import('@babel-8/core');
-    };
-  };
-}
+// We need to use the Node.js implementation of `require` to load Babel 8
+// packages, instead of our sandboxed implementation, because Babel 8 is
+// written in ESM and we don't support require(esm) yet.
+import Module from 'node:module';
+import {pathToFileURL} from 'node:url';
+const createOriginalNodeRequire = Object.getPrototypeOf(Module).createRequire;
+const originalNodeRequire = createOriginalNodeRequire(
+  pathToFileURL(__filename),
+);
 
 const {getCacheKey} =
   babelJest.createTransformer() as SyncTransformer<BabelTransformOptions>;
@@ -49,11 +46,11 @@ afterEach(() => {
 describe.each(
   [
     {babel: require('@babel/core'), version: '7'},
-    {
-      babel: globalThis.preloadedDependencies['babel-jest']['@babel-8/core'],
+    parseInt(process.versions.node) >= 20 && {
+      babel: originalNodeRequire('@babel-8/core'),
       version: '8',
     },
-  ].filter(v => v.babel !== null),
+  ].filter((x) => x !== false),
 )('babel $version', ({babel}) => {
   describe('getCacheKey', () => {
     const sourceText = 'mock source';

packages/babel-jest/src/__tests__/getCacheKey.test.ts

@@ -13,18 +13,15 @@ import {makeProjectConfig} from '@jest/test-utils';
 import type {SyncTransformer, TransformOptions} from '@jest/transform';
 import babelJest, {createTransformer} from '../index';
 
-// This is loaded by /jest.globalSetup.mjs. We need to pre-load it there
-// because this test file is being transpiled, leading to require(esm), which
-// we don't support yet.
-declare global {
-  // We need to use `var` to declare a global variable
-  // eslint-disable-next-line no-var
-  var preloadedDependencies: {
-    'babel-jest': {
-      '@babel-8/core': null | typeof import('@babel-8/core');
-    };
-  };
-}
+// We need to use the Node.js implementation of `require` to load Babel 8
+// packages, instead of our sandboxed implementation, because Babel 8 is
+// written in ESM and we don't support require(esm) yet.
+import Module from 'node:module';
+import {pathToFileURL} from 'node:url';
+const createOriginalNodeRequire = Object.getPrototypeOf(Module).createRequire;
+const originalNodeRequire = createOriginalNodeRequire(
+  pathToFileURL(__filename),
+);
 
 type BabelCore = typeof import('@babel-8/core');
 
@@ -65,11 +62,11 @@ customMultiply({a: 32, dummy: "test"}, 2);
 describe.each(
   [
     {babel: require('@babel/core'), version: '7'},
-    {
-      babel: globalThis.preloadedDependencies['babel-jest']['@babel-8/core'],
+    parseInt(process.versions.node) >= 20 && {
+      babel: originalNodeRequire('@babel-8/core'),
       version: '8',
     },
-  ].filter(v => v.babel !== null),
+  ].filter(x => x !== false),
 )('babel $version', ({babel}: {babel: BabelCore}) => {
   beforeEach(() => {
     jest.clearAllMocks();

packages/babel-jest/src/__tests__/index.ts

@@ -12,16 +12,15 @@ import pluginTester from 'babel-plugin-tester';
 import type {Options} from 'prettier';
 import babelPluginJestHoist from '..';
 
-// This is loaded by /jest.globalSetup.mjs. We need to pre-load it there
-// because this test file is being transpiled, leading to require(esm), which
-// we don't support yet.
-declare const preloadedDependencies: {
-  'babel-plugin-jest-hoist': {
-    '@babel-8/core': typeof import('@babel-8/core');
-    '@babel-8/preset-react': typeof import('@babel-8/preset-react');
-    '@babel-8/preset-typescript': typeof import('@babel-8/preset-typescript');
-  };
-};
+// We need to use the Node.js implementation of `require` to load Babel 8
+// packages, instead of our sandboxed implementation, because Babel 8 is
+// written in ESM and we don't support require(esm) yet.
+import Module from 'node:module';
+import {pathToFileURL} from 'node:url';
+const createOriginalNodeRequire = Object.getPrototypeOf(Module).createRequire;
+const originalNodeRequire = createOriginalNodeRequire(
+  pathToFileURL(__filename),
+);
 
 const prettierOptions: Options = {
   ...resolveConfig(__filename),
@@ -39,19 +38,13 @@ describe.each(
       presetTypescript: require('@babel/preset-typescript').default,
       version: '7',
     },
-    {
-      babel: preloadedDependencies['babel-plugin-jest-hoist']['@babel-8/core'],
-      presetReact:
-        preloadedDependencies['babel-plugin-jest-hoist'][
-          '@babel-8/preset-react'
-        ],
-      presetTypescript:
-        preloadedDependencies['babel-plugin-jest-hoist'][
-          '@babel-8/preset-typescript'
-        ],
+    parseInt(process.versions.node) >= 20 && {
+      babel: originalNodeRequire('@babel-8/core'),
+      presetReact: originalNodeRequire('@babel-8/preset-react'),
+      presetTypescript: originalNodeRequire('@babel-8/preset-typescript'),
       version: '8',
     },
-  ].filter(v => v.babel !== null),
+  ].filter(x => x !== false),
 )('babel $version', ({babel, presetReact, presetTypescript}) => {
   pluginTester({
     babel,