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Merged
merged 11 commits into from
Sep 28, 2025
+1,705 −560
Merged

Support Babel 8 in plugins and presets #15750

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1813d34
Support Babel 8 alongside with Babel 7
nicolo-ribaudo Jul 28, 2025
1290442
Add missing `.skip`
nicolo-ribaudo Sep 5, 2025
a20cb5c
Split Node.js 18 and Node.js 20+ tests in two files
nicolo-ribaudo Sep 5, 2025
0d1a932
Merge branch 'main' into babel-8-2
nicolo-ribaudo Sep 5, 2025
859f957
Use `onNodeVersions`
nicolo-ribaudo Sep 5, 2025
f69d353
Update lockfile
nicolo-ribaudo Sep 5, 2025
b0d043c
Update lockfile
nicolo-ribaudo Sep 12, 2025
a1b6901
Delete file.ts
nicolo-ribaudo Sep 12, 2025
737b82a
Revert "Split Node.js 18 and Node.js 20+ tests in two files"
nicolo-ribaudo Sep 12, 2025
92a3c81
Reapply "Split Node.js 18 and Node.js 20+ tests in two files"
nicolo-ribaudo Sep 12, 2025
1bc003d
Merge branch 'main' into babel-8-2
cpojer Sep 28, 2025
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2 changes: 1 addition & 1 deletion e2e/__tests__/__snapshots__/transform.test.ts.snap
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Expand Up @@ -6,7 +6,7 @@ exports[`babel-jest ignored tells user to match ignored files 1`] = `

babel-jest: Babel ignores __tests__/ignoredFile.test.js - make sure to include the file in Jest's transformIgnorePatterns as well.

at assertLoadedBabelConfig (../../../packages/babel-jest/build/index.js:137:11)"
at assertLoadedBabelConfig (../../../packages/babel-jest/build/index.js:148:11)"
`;

exports[`babel-jest instruments only specific files and collects coverage 1`] = `
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3 changes: 3 additions & 0 deletions jest.config.mjs
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Expand Up @@ -68,6 +68,9 @@ export default {
'/packages/jest-snapshot/src/__tests__/fixtures/',
'/e2e/__tests__/iterator-to-null-test.ts',
'/e2e/__tests__/tsIntegration.test.ts', // this test needs types to be build, it runs in a separate CI job through `jest.config.ts.mjs`
Number.parseInt(process.versions.node, 10) >= 20
? '/.*\\.nodejs18\\..*'
: '/.*\\.nodejs20plus\\..*',
],
testTimeout: 70_000,
transform: {
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3 changes: 2 additions & 1 deletion packages/babel-jest/package.json
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Expand Up @@ -29,12 +29,13 @@
"slash": "^3.0.0"
},
"devDependencies": {
"@babel-8/core": "npm:@babel/[email protected]",
"@babel/core": "^7.27.4",
"@jest/test-utils": "workspace:*",
"@types/graceful-fs": "^4.1.9"
},
"peerDependencies": {
"@babel/core": "^7.11.0"
"@babel/core": "^7.11.0 || ^8.0.0-0"
},
"engines": {
"node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
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315 changes: 182 additions & 133 deletions packages/babel-jest/src/__tests__/getCacheKey.test.ts
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Expand Up @@ -9,6 +9,17 @@ import type {TransformOptions as BabelTransformOptions} from '@babel/core';
import type {SyncTransformer, TransformOptions} from '@jest/transform';
import babelJest from '../index';

// 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';
import {onNodeVersions} from '@jest/test-utils';
const createOriginalNodeRequire = Object.getPrototypeOf(Module).createRequire;
const originalNodeRequire = createOriginalNodeRequire(
pathToFileURL(__filename),
);

const {getCacheKey} =
babelJest.createTransformer() as SyncTransformer<BabelTransformOptions>;

Expand All @@ -33,173 +44,211 @@ afterEach(() => {
}
});

describe('getCacheKey', () => {
const sourceText = 'mock source';
const sourcePath = 'mock-source-path.js';

const transformOptions = {
config: {rootDir: 'mock-root-dir'},
configString: 'mock-config-string',
instrument: true,
} as TransformOptions<BabelTransformOptions>;

const oldCacheKey = getCacheKey!(sourceText, sourcePath, transformOptions);

test('returns cache key hash', () => {
expect(oldCacheKey).toHaveLength(32);
});

test('if `THIS_FILE` value is changing', async () => {
jest.doMock('graceful-fs', () => ({
readFileSync: () => 'new this file',
}));

const {createTransformer} =
require('../index') as typeof import('../index');

const newCacheKey = (await createTransformer()).getCacheKey!(
sourceText,
sourcePath,
transformOptions,
);
describe('babel 7', () => {
defineTests({getBabel: () => require('@babel/core')});
});

expect(oldCacheKey).not.toEqual(newCacheKey);
describe('babel 8', () => {
onNodeVersions('>=20', () => {
defineTests({
getBabel: () => originalNodeRequire('@babel-8/core'),
});
});
});

test('if `babelOptions.options` value is changing', async () => {
jest.doMock('../loadBabelConfig', () => {
const babel = require('@babel/core') as typeof import('@babel/core');

return {
loadPartialConfig: (options: BabelTransformOptions) => ({
...babel.loadPartialConfig(options),
options: 'new-options',
}),
};
function defineTests({
getBabel,
}: {
getBabel: () => typeof import('@babel-8/core');
}) {
describe('getCacheKey', () => {
let babel: typeof import('@babel-8/core');
beforeAll(() => {
babel = getBabel();
});

const {createTransformer} =
require('../index') as typeof import('../index');
const sourceText = 'mock source';
const sourcePath = 'mock-source-path.js';

const newCacheKey = (await createTransformer()).getCacheKey!(
sourceText,
sourcePath,
transformOptions,
);
const transformOptions = {
config: {rootDir: 'mock-root-dir'},
configString: 'mock-config-string',
instrument: true,
} as TransformOptions<BabelTransformOptions>;

expect(oldCacheKey).not.toEqual(newCacheKey);
});
const oldCacheKey = getCacheKey!(sourceText, sourcePath, transformOptions);

test('if `sourceText` value is changing', () => {
const newCacheKey = getCacheKey!(
'new source text',
sourcePath,
transformOptions,
);
test('returns cache key hash', () => {
expect(oldCacheKey).toHaveLength(32);
});

expect(oldCacheKey).not.toEqual(newCacheKey);
});
test('if `THIS_FILE` value is changing', async () => {
jest.doMock('graceful-fs', () => ({
readFileSync: () => 'new this file',
}));

test('if `sourcePath` value is changing', () => {
const newCacheKey = getCacheKey!(
sourceText,
'new-source-path.js',
transformOptions,
);
const {createTransformer} =
require('../index') as typeof import('../index');

expect(oldCacheKey).not.toEqual(newCacheKey);
});
const newCacheKey = (await createTransformer()).getCacheKey!(
sourceText,
sourcePath,
transformOptions,
);

test('if `configString` value is changing', () => {
const newCacheKey = getCacheKey!(sourceText, sourcePath, {
...transformOptions,
configString: 'new-config-string',
expect(oldCacheKey).not.toEqual(newCacheKey);
});

expect(oldCacheKey).not.toEqual(newCacheKey);
});
test('if `babelOptions.options` value is changing', async () => {
jest.doMock('../babel', () => {
return {
...babel,
loadPartialConfigSync: (
options: Parameters<typeof babel.loadPartialConfigSync>[0],
) => ({
...babel.loadPartialConfigSync(options),
options: 'new-options',
}),
};
});

const {createTransformer} =
require('../index') as typeof import('../index');

const newCacheKey = (await createTransformer()).getCacheKey!(
sourceText,
sourcePath,
transformOptions,
);

expect(oldCacheKey).not.toEqual(newCacheKey);
});

test('if `babelOptions.config` value is changing', async () => {
jest.doMock('../loadBabelConfig', () => {
const babel = require('@babel/core') as typeof import('@babel/core');
test('if `sourceText` value is changing', () => {
const newCacheKey = getCacheKey!(
'new source text',
sourcePath,
transformOptions,
);

return {
loadPartialConfig: (options: BabelTransformOptions) => ({
...babel.loadPartialConfig(options),
config: 'new-config',
}),
};
expect(oldCacheKey).not.toEqual(newCacheKey);
});

const {createTransformer} =
require('../index') as typeof import('../index');

const newCacheKey = (await createTransformer()).getCacheKey!(
sourceText,
sourcePath,
transformOptions,
);
test('if `sourcePath` value is changing', () => {
const newCacheKey = getCacheKey!(
sourceText,
'new-source-path.js',
transformOptions,
);

expect(oldCacheKey).not.toEqual(newCacheKey);
});
expect(oldCacheKey).not.toEqual(newCacheKey);
});

test('if `babelOptions.babelrc` value is changing', async () => {
jest.doMock('../loadBabelConfig', () => {
const babel = require('@babel/core') as typeof import('@babel/core');
test('if `configString` value is changing', () => {
const newCacheKey = getCacheKey!(sourceText, sourcePath, {
...transformOptions,
configString: 'new-config-string',
});

return {
loadPartialConfig: (options: BabelTransformOptions) => ({
...babel.loadPartialConfig(options),
babelrc: 'new-babelrc',
}),
};
expect(oldCacheKey).not.toEqual(newCacheKey);
});

const {createTransformer} =
require('../index') as typeof import('../index');
test('if `babelOptions.config` value is changing', async () => {
jest.doMock('../babel', () => {
return {
...babel,
loadPartialConfigSync: (
options: Parameters<typeof babel.loadPartialConfigSync>[0],
) => ({
...babel.loadPartialConfigSync(options),
config: 'new-config',
}),
};
});

const {createTransformer} =
require('../index') as typeof import('../index');

const newCacheKey = (await createTransformer()).getCacheKey!(
sourceText,
sourcePath,
transformOptions,
);

expect(oldCacheKey).not.toEqual(newCacheKey);
});

const newCacheKey = (await createTransformer()).getCacheKey!(
sourceText,
sourcePath,
transformOptions,
);
test('if `babelOptions.babelrc` value is changing', async () => {
jest.doMock('../babel', () => {
return {
...babel,
loadPartialConfig: (
options: Parameters<typeof babel.loadPartialConfig>[0],
) => ({
...babel.loadPartialConfig(options),
babelrc: 'new-babelrc',
}),
};
});

const {createTransformer} =
require('../index') as typeof import('../index');

const newCacheKey = (await createTransformer()).getCacheKey!(
sourceText,
sourcePath,
transformOptions,
);

expect(oldCacheKey).not.toEqual(newCacheKey);
});

expect(oldCacheKey).not.toEqual(newCacheKey);
});
test('if `instrument` value is changing', () => {
const newCacheKey = getCacheKey!(sourceText, sourcePath, {
...transformOptions,
instrument: false,
});

test('if `instrument` value is changing', () => {
const newCacheKey = getCacheKey!(sourceText, sourcePath, {
...transformOptions,
instrument: false,
expect(oldCacheKey).not.toEqual(newCacheKey);
});

expect(oldCacheKey).not.toEqual(newCacheKey);
});

test('if `process.env.NODE_ENV` value is changing', () => {
process.env.NODE_ENV = 'NEW_NODE_ENV';
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);
});
expect(oldCacheKey).not.toEqual(newCacheKey);
});

test('if `process.env.BABEL_ENV` value is changing', () => {
process.env.BABEL_ENV = 'NEW_BABEL_ENV';
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);
});
expect(oldCacheKey).not.toEqual(newCacheKey);
});

test('if node version is changing', () => {
// @ts-expect-error: Testing purpose
delete process.version;
// @ts-expect-error: Testing purpose
process.version = 'new-node-version';
test('if node version is changing', () => {
// @ts-expect-error: Testing purpose
delete process.version;
// @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);
expect(oldCacheKey).not.toEqual(newCacheKey);
});
});
});
}
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