Only test Babel 8 in Node.js 20+

Author: nicolo-ribaudo

jest.globalSetup.mjs

@@ -1,12 +1,16 @@
 import {createRequire} from 'node:module';
 const require = createRequire(import.meta.url);
 
-const requireFrom = (from, name) =>
-  require(
+const requireFrom = (from, name) => {
+  if (parseInt(process.versions.node, 10) < 20) {
+    return null;
+  }
+  return require(
     require.resolve(name, {
       paths: [require.resolve(`./packages/${from}/package.json`)],
     }),
   );
+};
 
 export default async function () {
   globalThis.preloadedDependencies = {

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

@@ -15,7 +15,7 @@ import babelJest from '../index';
 declare global {
   var preloadedDependencies: {
     'babel-jest': {
-      '@babel-8/core': typeof import('@babel-8/core');
+      '@babel-8/core': null | typeof import('@babel-8/core');
     };
   };
 }
@@ -44,10 +44,15 @@ afterEach(() => {
   }
 });
 
-describe.each([
-  { version: '7', babel: require('@babel/core') },
-  { version: '8', babel: globalThis.preloadedDependencies['babel-jest']['@babel-8/core'], }
-])(`babel $version`, ({ babel }) => {
+describe.each(
+  [
+    {version: '7', babel: require('@babel/core')},
+    {
+      version: '8',
+      babel: globalThis.preloadedDependencies['babel-jest']['@babel-8/core'],
+    },
+  ].filter(v => v.babel),
+)(`babel $version`, ({babel}) => {
   describe('getCacheKey', () => {
     const sourceText = 'mock source';
     const sourcePath = 'mock-source-path.js';
@@ -164,7 +169,9 @@ describe.each([
       jest.doMock('../babel', () => {
         return {
           ...babel,
-          loadPartialConfig: (options: Parameters<typeof babel.loadPartialConfig>[0]) => ({
+          loadPartialConfig: (
+            options: Parameters<typeof babel.loadPartialConfig>[0],
+          ) => ({
             ...babel.loadPartialConfig(options),
             babelrc: 'new-babelrc',
           }),
@@ -195,15 +202,23 @@ describe.each([
     test('if `process.env.NODE_ENV` value is changing', () => {
       process.env.NODE_ENV = 'NEW_NODE_ENV';
 
-      const newCacheKey = getCacheKey!(sourceText, sourcePath, transformOptions);
+      const newCacheKey = getCacheKey!(
+        sourceText,
+        sourcePath,
+        transformOptions,
+      );
 
       expect(oldCacheKey).not.toEqual(newCacheKey);
     });
 
     test('if `process.env.BABEL_ENV` value is changing', () => {
       process.env.BABEL_ENV = 'NEW_BABEL_ENV';
 
-      const newCacheKey = getCacheKey!(sourceText, sourcePath, transformOptions);
+      const newCacheKey = getCacheKey!(
+        sourceText,
+        sourcePath,
+        transformOptions,
+      );
 
       expect(oldCacheKey).not.toEqual(newCacheKey);
     });
@@ -214,7 +229,11 @@ describe.each([
       // @ts-expect-error: Testing purpose
       process.version = 'new-node-version';
 
-      const newCacheKey = getCacheKey!(sourceText, sourcePath, transformOptions);
+      const newCacheKey = getCacheKey!(
+        sourceText,
+        sourcePath,
+        transformOptions,
+      );
 
       expect(oldCacheKey).not.toEqual(newCacheKey);
     });

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

@@ -19,7 +19,7 @@ import babelJest, {createTransformer} from '../index';
 declare global {
   var preloadedDependencies: {
     'babel-jest': {
-      '@babel-8/core': typeof import('@babel-8/core');
+      '@babel-8/core': null | typeof import('@babel-8/core');
     };
   };
 }
@@ -58,14 +58,15 @@ const customMultiply = (obj, mul) => {
 customMultiply({a: 32, dummy: "test"}, 2);
 `;
 
-
-describe.each([
-  {version: '7', babel: require('@babel/core')},
-  {
-    version: '8',
-    babel: globalThis.preloadedDependencies['babel-jest']['@babel-8/core'],
-  },
-])(`babel $version`, ({babel}: {babel: BabelCore}) => {
+describe.each(
+  [
+    {version: '7', babel: require('@babel/core')},
+    {
+      version: '8',
+      babel: globalThis.preloadedDependencies['babel-jest']['@babel-8/core'],
+    },
+  ].filter(v => v.babel),
+)(`babel $version`, ({babel}: {babel: BabelCore}) => {
   beforeEach(() => {
     jest.clearAllMocks();
 
@@ -211,7 +212,9 @@ describe.each([
 
     expect(mockedBabel.loadPartialConfigSync).toHaveBeenCalledTimes(1);
     expect(mockedBabel.loadPartialConfigSync).toHaveBeenCalledWith(
-      expect.objectContaining({presets: [require.resolve('babel-preset-jest')]}),
+      expect.objectContaining({
+        presets: [require.resolve('babel-preset-jest')],
+      }),
     );
   });
 

packages/babel-plugin-jest-hoist/src/__tests__/hoistPlugin.test.ts

@@ -31,20 +31,28 @@ const prettierOptions: Options = {
 
 const formatResult = (code: string) => formatCode(code, prettierOptions);
 
-describe.each([
-  {
-    version: '7',
-    babel: require('@babel/core'),
-    presetReact: require('@babel/preset-react').default,
-    presetTypescript: require('@babel/preset-typescript').default,
-  },
-  {
-    version: '8',
-    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'],
-  },
-])('babel $version', ({babel, presetReact, presetTypescript}) => {
+describe.each(
+  [
+    {
+      version: '7',
+      babel: require('@babel/core'),
+      presetReact: require('@babel/preset-react').default,
+      presetTypescript: require('@babel/preset-typescript').default,
+    },
+    {
+      version: '8',
+      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'
+        ],
+    },
+  ].filter(v => v.babel),
+)('babel $version', ({babel, presetReact, presetTypescript}) => {
   pluginTester({
     babel,
     plugin: babelPluginJestHoist,
@@ -56,12 +64,7 @@ describe.each([
           babelrc: false,
           configFile: false,
           filename: path.resolve(__dirname, '../file.js'),
-          presets: [
-            [
-              presetReact,
-              {development: true, runtime: 'automatic'},
-            ],
-          ],
+          presets: [[presetReact, {development: true, runtime: 'automatic'}]],
         },
         code: formatResult(`
           jest.mock('./App', () => () => <div>Hello world</div>);