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Babel Preset Default: Add polyfill for WordPress built from core-js #31279

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merged 2 commits into from May 22, 2021
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Babel Preset Default: Add polyfill for WordPress built from core-js #31279

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Babel Preset Default: Add polyfill for WordPress built from core-js
gziolo Apr 28, 2021
9ef7611
Address feedback from code review
gziolo May 22, 2021
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1 change: 1 addition & 0 deletions .eslintrc.js
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Expand Up @@ -28,6 +28,7 @@ const developmentFiles = [
'**/benchmark/**/*.js',
'**/@(__mocks__|__tests__|test)/**/*.js',
'**/@(storybook|stories)/**/*.js',
'packages/babel-preset-default/bin/**/*.js',
];

// All files from packages that have types provided with TypeScript.
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359 changes: 109 additions & 250 deletions package-lock.json
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2 changes: 2 additions & 0 deletions package.json
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Expand Up @@ -156,6 +156,7 @@
"commander": "4.1.0",
"concurrently": "3.5.0",
"copy-webpack-plugin": "5.1.2",
"core-js-builder": "3.11.0",
"cross-env": "3.2.4",
"css-loader": "5.1.3",
"cssnano": "4.1.10",
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"style-loader": "2.0.0",
"terser-webpack-plugin": "3.0.3",
"typescript": "4.1.3",
"uglify-js": "3.13.7",
"uuid": "8.3.0",
"wd": "1.12.1",
"webpack": "4.46.0",
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4 changes: 4 additions & 0 deletions packages/babel-preset-default/CHANGELOG.md
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Expand Up @@ -2,6 +2,10 @@

## Unreleased

### New Feature

- New `build/polyfill.js` (minified version – `build/polyfill.min.js`) file is available that polyfills ECMAScript features missing in the [browsers supported](https://make.wordpress.org/core/handbook/best-practices/browser-support/) by the WordPress project. It's a drop-in replacement for the deprecated `@babel/polyfill` package ([#31279](https://github.com/WordPress/gutenberg/pull/31279)).

## 6.1.0 (2021-05-20)

### Bug Fixes
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10 changes: 10 additions & 0 deletions packages/babel-preset-default/README.md
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Expand Up @@ -39,4 +39,14 @@ For example, if you'd like to use a new language feature proposal which has not
}
```

### Polyfill

There is a complementary `build/polyfill.js` (minified version – `build/polyfill.min.js`) file available that polyfills ECMAScript features missing in the [browsers supported](https://make.wordpress.org/core/handbook/best-practices/browser-support/) by the WordPress project ([#31279](https://github.com/WordPress/gutenberg/pull/31279)). It's a drop-in replacement for the deprecated `@babel/polyfill` package, and it's also based on [`core-js`](https://github.com/zloirock/core-js) project.

This needs to be included before all your compiled Babel code. You can either prepend it to your compiled code or include it in a `<script>` before it.

#### TC39 Proposals

If you need to use a proposal that is not Stage 4, this polyfill will not automatically import those for you. You will have to import those from another polyfill like [`core-js`](https://github.com/zloirock/core-js) individually.

<br/><br/><p align="center"><img src="https://s.w.org/style/images/codeispoetry.png?1" alt="Code is Poetry." /></p>
33 changes: 33 additions & 0 deletions packages/babel-preset-default/bin/index.js
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@@ -0,0 +1,33 @@
#!/usr/bin/env node

Comment on lines +1 to +2
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@gziolo: As much as I love shebangs, AFAIK they just don't work well or at all with Windows. This just emerged in #32329. I'm wondering if we should/could forbid it with our linter — wdyt?

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I copied it over from other scripts. What would be the alternative? If it causes issues we should teach ESLint to prevent issues.

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The alternative would be to just not have any shebang, meaning that scripts would just have code:

1. /**
2.  * External dependencies
3.  */
4. const builder = ...;

This would make it impossible for anyone in a UNIX system to invoke ./index.js (they would have to explicitly call the interpreter with node index.js), thus eliminating the possibility of merging something that would break in Windows.

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Sounds good, we can live with it 👍🏻

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Filed: #32504.

/**
* External dependencies
*/
const builder = require( 'core-js-builder' );
const { minify } = require( 'uglify-js' );
const { writeFile } = require( 'fs' ).promises;

builder( {
modules: [ 'es', 'web' ],
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It's based on:

https://github.com/zloirock/core-js/blob/67ad54d1f1c455c300e4757e72039d8b586b743c/scripts/generate-indexes.js#L26

// core-js is extremely conservative in which polyfills to include.
// Knowing about tiny browser implementation bugs that anyone rarely cares about,
// we prevent some features from having the full polyfill included.
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I don't really understand the comment. What does core-js being conservative have to do with use excluding more things? And what tiny browser implementation bugs? To me the latter makes it sound like it reimplements everything?

// @see https://github.com/WordPress/gutenberg/pull/31279
exclude: [ 'es.promise' ],
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targets: require( '@wordpress/browserslist-config' ),
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filename: './build/polyfill.js',
} )
.then( async ( code ) => {
const output = minify( code, {
output: {
comments: ( node, comment ) =>
comment.value.indexOf( 'License' ) >= 0,
},
} );
await writeFile( './build/polyfill.min.js', output.code );
} )
.catch( ( error ) => {
// eslint-disable-next-line no-console
console.log( error );
process.exit( 1 );
} );
6 changes: 5 additions & 1 deletion packages/babel-preset-default/package.json
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Expand Up @@ -24,6 +24,7 @@
"node": ">=12"
},
"files": [
"build",
"index.js"
],
"main": "index.js",
Expand All @@ -39,9 +40,12 @@
"@wordpress/element": "file:../element",
"@wordpress/warning": "file:../warning",
"browserslist": "^4.16.6",
"core-js": "^3.6.4"
"core-js": "^3.12.1"
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},
"publishConfig": {
"access": "public"
},
"scripts": {
"build": "./bin/index.js"
}
}
2 changes: 1 addition & 1 deletion packages/react-native-editor/package.json
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Expand Up @@ -49,7 +49,7 @@
"@wordpress/i18n": "file:../i18n",
"@wordpress/react-native-aztec": "file:../react-native-aztec",
"@wordpress/react-native-bridge": "file:../react-native-bridge",
"core-js": "^3.8.3",
"core-js": "^3.12.1",
"fast-average-color": "^4.3.0",
"jed": "^1.1.1",
"jsc-android": "^241213.1.0",
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