ESLint sharable config to activate eslint-plugin-es checks based on browserslist targets.

Usage no npm install needed!

<script type="module">
  import automatticEslintConfigTargetEs from 'https://cdn.skypack.dev/@automattic/eslint-config-target-es';



ESLint shareable config to activate eslint-plugin-es checks based on browserslist browser targets and MDN browser compatibility data.


Generally you'll install this via your package manager, e.g.

npm install --save-dev eslint eslint-plugin-es @automattic/eslint-config-target-es


First, you'll probably want to set up a browserslist configuration.

Then you can use this like any other sharable config in your .eslintrc.* file. Three configurations are offered.

To check only for language features, such as nullish coalescing, your eslintrc might look like

    extends: [ '@automattic/eslint-config-target-es/language' ],

To check only for builtins, such as Promise, WeakRef, and various features of RegExp, your eslintrc might look like

    extends: [ '@automattic/eslint-config-target-es/builtins' ],

To check both, your eslintrc might look like

    extends: [ '@automattic/eslint-config-target-es/all' ],

For least surprise, omitting any suffix is the same as /all.

Checking built files

If you want to check your built files to make sure you didn't omit transpiling any packages that need transpiling, you might create a validate-es.config.js like this

module.exports = {
    root: true,
    extends: [ '@automattic/eslint-config-target-es/language' ],
    env: {
        // Whatever environments you need.

and then run eslint like

eslint --no-eslintrc --no-inline-config --config validate-es.config.js --no-ignore build/

to avoid your standard eslintrc and eslintignore and to avoid errors from any inline directives.

Advanced usage

You can import or require @automattic/eslint-config-target-es/functions to gain access to some functions that can be used to build your own configuration.

As browserslist and MDN use different browser codes, getBrowsers( { query: } ) will take a browserslist query and return an object with the MDN browser codes and the minimum matched version for each.

getRules( { query:, builtins: } ) will return the rules config. Set builtins true for "builtins", false for "language", or null/undefined for "all".


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eslint-config-target-es is licensed under GNU General Public License v2 (or later)