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Prepare for Babel 8 #250

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Merged
nicolo-ribaudo merged 12 commits into from
Mar 6, 2026
Merged

Prepare for Babel 8 #250

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d6ea358
Remove babel-plugin-polyfill-corejs2
nicolo-ribaudo Mar 6, 2026
3ae80f8
Align `engines` with Babel 8
nicolo-ribaudo Mar 6, 2026
e386a2a
Run tests in native ESM
nicolo-ribaudo Mar 6, 2026
83dfac2
Use ESM, update Rollup and Webpack
nicolo-ribaudo Mar 6, 2026
ca30a2e
Remove `resolve` dependency
nicolo-ribaudo Mar 6, 2026
0f6b6c4
Remove unused `debug` dependency
nicolo-ribaudo Mar 6, 2026
97433e1
Update other Rollup
nicolo-ribaudo Mar 6, 2026
3569b97
`yarn dedupe`
nicolo-ribaudo Mar 6, 2026
1e2eeb5
Update CI Node.js versions
nicolo-ribaudo Mar 6, 2026
50bdec9
Fix type error
nicolo-ribaudo Mar 6, 2026
aec3bc5
Fix windows CI
nicolo-ribaudo Mar 6, 2026
523fbac
Skip TS tests in Node.js 20
nicolo-ribaudo Mar 6, 2026
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1 change: 0 additions & 1 deletion .eslintignore
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Expand Up @@ -8,4 +8,3 @@ packages/*/lib
packages/*/esm
packages/*/test/fixtures
packages/*/test/spawn-fixtures
packages/babel-plugin-polyfill-corejs2/data/*
11 changes: 5 additions & 6 deletions .github/workflows/ci.yml
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Expand Up @@ -49,19 +49,15 @@ jobs:
runs-on: ubuntu-latest
strategy:
matrix:
node-version: [18, 16, 14]
node-version: [20, 22, 24]
steps:
- name: Checkout code
uses: actions/checkout@v3
- name: Use Node.js latest
uses: actions/setup-node@v3
with:
cache: "yarn"
- name: Downgrade Yarn and install
if: ${{ matrix.node-version < 18 }}
run: yarn set version 3 && yarn install --no-frozen-lockfile
- name: Install
if: ${{ matrix.node-version >= 18 }}
run: yarn install
- name: Build
run: yarn build
Expand All @@ -71,6 +67,9 @@ jobs:
uses: actions/setup-node@v3
with:
node-version: ${{ matrix.node-version }}
- name: Delete tests that import .ts files
if: matrix.node-version == '20'
run: rm packages/babel-helper-define-polyfill-provider/test/meta-resolver.js packages/babel-plugin-polyfill-corejs3/test/check-builtin-definitions.test.js
- name: Test on Node.js ${{ matrix.node-version }}
# `maxWorkers` cannot be 1 because we are using `process.exitCode` in our tests.
run: yarn jest --ci --color --maxWorkers=2
Expand All @@ -95,7 +94,7 @@ jobs:
shell: bash
run: yarn build-es-shims-data
- name: Build
run: yarn build-corejs3-shipped-proposals && gulp build && gulp bundle
run: yarn build-corejs3-shipped-proposals && gulp build
- name: Test on Node.js latest
# `maxWorkers` cannot be 1 because we are using `process.exitCode` in our tests.
run: yarn jest --ci --color --maxWorkers=2
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1 change: 0 additions & 1 deletion .prettierignore
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Expand Up @@ -2,5 +2,4 @@ package.json
packages/*/test/fixtures/**/input.*
packages/*/test/fixtures/**/exec.*
packages/*/test/fixtures/**/output.*
packages/babel-plugin-polyfill-corejs2/data/*
packages/babel-plugin-polyfill-corejs3/src/shipped-proposals.js
62 changes: 4 additions & 58 deletions Gulpfile.js
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@@ -1,12 +1,6 @@
"use strict";

const plumber = require("gulp-plumber");
const through = require("through2");
const chalk = require("chalk");
const newer = require("gulp-newer");
const babel = require("gulp-babel");
const gulpWatch = require("gulp-watch");
const fancyLog = require("fancy-log");
const gulp = require("gulp");
const path = require("path");
const rollup = require("rollup").rollup;
Expand All @@ -17,57 +11,11 @@ const rollupJson = require("@rollup/plugin-json");
const esmBundles = [
{ name: "babel-helper-define-polyfill-provider", target: "node" },
{ name: "babel-helper-define-polyfill-provider", target: "browser" },
{ name: "babel-plugin-polyfill-corejs2" },
{ name: "babel-plugin-polyfill-corejs3" },
{ name: "babel-plugin-polyfill-es-shims" },
{ name: "babel-plugin-polyfill-regenerator" },
];

function swapSrcWithLib(srcPath) {
const parts = srcPath.split(path.sep);
parts[1] = "lib";
return parts.join(path.sep);
}

function compilationLogger() {
return through.obj(function (file, enc, callback) {
fancyLog(`Compiling '${chalk.cyan(file.relative)}'...`);
callback(null, file);
});
}

function errorsLogger() {
return plumber({
errorHandler(err) {
fancyLog(err.stack);
},
});
}

function rename(fn) {
return through.obj(function (file, enc, callback) {
file.path = fn(file);
callback(null, file);
});
}

function build() {
const base = path.join(__dirname, "packages");

return gulp
.src("./packages/*/src/**/*.{js,ts}", { base: base })
.pipe(errorsLogger())
.pipe(newer({ dest: base, map: swapSrcWithLib }))
.pipe(compilationLogger())
.pipe(babel())
.pipe(
// Passing 'file.relative' because newer() above uses a relative
// path and this keeps it consistent.
rename(file => path.resolve(file.base, swapSrcWithLib(file.relative)))
)
.pipe(gulp.dest(base));
}

async function buildRollup() {
const base = path.join(__dirname, "packages");

Expand All @@ -90,7 +38,6 @@ async function buildRollup() {
plugins: [
rollupJson(),
rollupBabel({
envName: "esm",
babelrc: false,
babelHelpers: "bundled",
extends: "./babel.config.json",
Expand All @@ -105,21 +52,20 @@ async function buildRollup() {
});

const outputFile = target
? `${dir}/esm/index.${target}.mjs`
: `${dir}/esm/index.mjs`;
? `${dir}/lib/index.${target}.js`
: `${dir}/lib/index.js`;
await bundle.write({
file: outputFile,
format: "es",
sourcemap: true,
exports: "named",
importAttributesKey: "with",
});
})
);
}

gulp.task("build", () => build());

gulp.task("bundle", () => buildRollup());
gulp.task("build", () => buildRollup());

gulp.task("default", gulp.series("build"));

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1 change: 0 additions & 1 deletion README.md
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Expand Up @@ -88,7 +88,6 @@ If you are interested in reading about all the options supported by these plugin
<!--prettier-ignore -->
| Polyfill | Plugin | Methods |
| :------: | :----: | :-----: |
| `core-js@2` | [`babel-plugin-polyfill-corejs2`](./packages/babel-plugin-polyfill-corejs2) | `entry-global`, `usage-global` and `usage-pure` |
| `core-js@3` | [`babel-plugin-polyfill-corejs3`](./packages/babel-plugin-polyfill-corejs3) | `entry-global`, `usage-global` and `usage-pure` |
| `es-shims` | [`babel-plugin-polyfill-es-shims`](./packages/babel-plugin-polyfill-es-shims) | `usage-global` and `usage-pure` |
| `regenerator-runtime` | [`babel-plugin-polyfill-regenerator`](./packages/babel-plugin-polyfill-regenerator) | `entry-global`, `usage-global` and `usage-pure` |
Expand Down
14 changes: 2 additions & 12 deletions babel.config.json
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Expand Up @@ -4,21 +4,11 @@
["@babel/preset-env", { "loose": true }],
"@babel/preset-typescript"
],
"plugins": [
"./scripts/babel-plugin-remove-create-require",
"./scripts/babel-plugin-compat-core-import"
],
"plugins": ["./scripts/babel-plugin-compat-core-import"],
"targets": { "node": "current" },
"env": {
"production": {
"targets": { "node": "6.9" }
},
"esm": {
"targets": { "node": "12.20" },
"plugins": [
// Disable it
["./scripts/babel-plugin-remove-create-require", false]
]
"targets": { "node": "20.19" }
}
}
}
135 changes: 0 additions & 135 deletions docs/migration.md
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Expand Up @@ -230,138 +230,3 @@ All the existig capabilities of `@babel/preset-env` and `@babel/plugin-transform
</tr>
</table>
<!-- prettier-ignore-end -->

### `core-js@2`

<!-- prettier-ignore-start -->
<table>
<thead><tr>
<th align="center">Old configuration</th>
<th align="center">New configuration</th>
</tr></thead>
<tr>
<td>

```json
{
"presets": [
["@babel/preset-env", {
"targets": { "firefox": 42 },
"useBuiltIns": "usage",
"corejs": 2
}]
]
}
```

</td>
<td>

```json
{
"targets": { "firefox": 42 },
"presets": ["@babel/preset-env"],
"plugins": [
["polyfill-corejs2", {
"method": "usage-global"
}]
]
}
```

</td>
</tr>
</table>
<!-- prettier-ignore-end -->


<!-- prettier-ignore-start -->
<table>
<thead><tr>
<th align="center">Old configuration</th>
<th align="center">New configuration</th>
</tr></thead>
<tr>
<td>

```json
{
"presets": [
["@babel/preset-env", {
"targets": { "firefox": 42 },
"useBuiltIns": "entry",
"corejs": 2
}]
]
}
```

</td>
<td>

```json
{
"targets": { "firefox": 42 },
"presets": ["@babel/preset-env"],
"plugins": [
["polyfill-corejs2", {
"method": "entry-global"
}]
]
}
```

</td>
</tr>
</table>
<!-- prettier-ignore-end -->

<!-- prettier-ignore-start -->
<table>
<thead><tr>
<th align="center">Old configuration</th>
<th align="center">New configuration</th>
</tr></thead>
<tr>
<td>

```json
{
"presets": [
["@babel/preset-env", {
"targets": { "firefox": 42 }
}]
],
"plugins": [
["@babel/transform-runtime", {
"corejs": 2
}]
]
}
```

</td>
<td>

```json
{
"presets": [
["@babel/preset-env", {
"targets": { "firefox": 42 }
}]
],
"plugins": [
"@babel/transform-runtime",
["polyfill-corejs2", {
"method": "usage-pure"
}]
]
}
```

**NOTE**: The "Old" config doesn't support targets for polyfills, but you'll likely want to enable them by moving the `targets` option to the top-level.

</td>
</tr>
</table>
<!-- prettier-ignore-end -->
24 changes: 10 additions & 14 deletions package.json
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Expand Up @@ -3,10 +3,10 @@
"private": true,
"license": "MIT",
"scripts": {
"build": "yarn build-es-shims-data && yarn build-corejs3-shipped-proposals && gulp build && gulp bundle",
"build": "yarn build-es-shims-data && yarn build-corejs3-shipped-proposals && gulp build",
"build-corejs3-shipped-proposals": "node ./scripts/build-corejs3-shipped-proposals.mjs",
"build-es-shims-data": "node ./scripts/download-compat-table.js && node ./scripts/build-es-shims-data",
"clean": "rimraf packages/*/lib packages/*/esm",
"clean": "rimraf packages/*/lib",
"clean-all": "yarn clean && rimraf packages/*/node_modules node_modules",
"lint": "eslint packages '*.{js,ts}' --ext .js,.ts --format=codeframe",
"publish": "yarn clean && NODE_ENV=production yarn build && yarn validate && lerna publish from-git",
Expand All @@ -26,34 +26,29 @@
"@babel/preset-env": "^7.28.6",
"@babel/preset-typescript": "^7.28.5",
"@babel/runtime": "^7.28.6",
"@rollup/plugin-babel": "^5.3.1",
"@rollup/plugin-json": "^4.1.0",
"@rollup/plugin-node-resolve": "^11.2.1",
"@rollup/plugin-babel": "^7.0.0",
"@rollup/plugin-json": "^6.1.0",
"@rollup/plugin-node-resolve": "^16.0.3",
"@types/babel__traverse": "^7.28.0",
"@typescript-eslint/eslint-plugin": "^8.53.1",
"@typescript-eslint/parser": "^8.53.1",
"babel-jest": "^29.7.0",
"chalk": "^3.0.0",
"electron-to-chromium": "^1.5.278",
"eslint": "^8.57.1",
"eslint-formatter-codeframe": "^7.32.2",
"eslint-plugin-import": "^2.32.0",
"eslint-plugin-prettier": "^5.5.5",
"fancy-log": "^1.3.3",
"gulp": "^4.0.2",
"gulp-babel": "^8.0.0",
"gulp-newer": "^1.4.0",
"gulp-plumber": "^1.2.1",
"gulp-rename": "^1.4.0",
"gulp-uglify": "^3.0.2",
"gulp-watch": "^5.0.1",
"jest": "^27.5.1",
"jest": "^30.2.0",
"jest-light-runner": "^0.7.11",
"lerna": "^3.22.1",
"lodash": "^4.17.23",
"prettier": "^3.8.1",
"rimraf": "^2.7.1",
"rollup": "^2.79.2",
"through2": "^2.0.5",
"rollup": "^4.59.0",
"typescript": "^5.9.3"
},
"resolutions": {
Expand All @@ -64,14 +59,15 @@
"@babel/preset-env/core-js-compat": "^3.48.0"
},
"engines": {
"node": ">= 6.9.0",
"node": "^20.19.0 || >=22.12.0",
"yarn": ">=1.0.0"
},
"workspaces": [
"packages/*",
"test/esm"
],
"jest": {
"runner": "jest-light-runner",
"testRegex": "./packages/[^/]+/test/.+\\.m?js$",
"testPathIgnorePatterns": [
"/node_modules/",
Expand Down
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