Update core-js-compat

Tips

If you have no access to all required browsers / versions of browsers, use Sauce Labs, BrowserStack or Cloud Browser.

Update existing data

For updating core-js-compat data:

• If you want to add a new data for a browser, run tests/compat/index.html in this browser (tests and results for the actual release are available at Compat Form) and you will see what Core-JS modules are required for this browser.

• If you want to add new data for NodeJS, run npm run compat-node with the installed required NodeJS version and you will see the results in the console. Use npm run compat-node json if you want to get the result as JSON.
• If you want to add new data for Deno, run npm run compat-deno with the installed required Deno version and you will see the results in the console. Use npm run compat-deno json if you want to get the result as JSON.
• If you want to add new data for Bun, run npm run compat-bun with the installed required Bun version and you will see the results in the console.
• If you want to add new data for Rhino, set the required Rhino version in compat-rhino NPM script in package.json, run npm run compat-rhino and you will see the results in the console.
• If you want to add new data for Hermes (incl. shipped with React Native), run npm run compat-hermes YOR_PATH_TO_HERMES and you will see the results in the console.
• After getting this data, add it to packages/core-js-compat/src/data.mjs.

Add a new mapping

If you want to add new mapping (for example, to add a new iOS Safari version based on Safari or NodeJS based on Chrome), add it to packages/core-js-compat/src/mapping.mjs.

engine	how to run tests	base data inherits from	mandatory check	mapping for a new version
android	browser runner	chrome, chrome-android
bun	bun runner	safari (only ES)	required
chrome	browser runner		required
chrome-android	browser runner	chrome
deno	deno runner	chrome (only ES)	non-ES features	required
edge	browser runner	ie, chrome	required (<= 18)
electron	browser runner	chrome		required
firefox	browser runner		required
firefox-android	browser runner	firefox
hermes	hermes runner		required
ie	browser runner		required
ios	browser runner	safari		if inconsistent (!= safari)
node	node runner	chrome (only ES)	non-ES features	required
opera	browser runner	chrome		if inconsistent (!= chrome - 14)
opera-android	browser runner	opera, chrome-android		required
phantom	browser runner	safari
quest	browser runner	chrome-android		required
react-native	hermes runner	hermes	required
rhino	rhino runner		required
safari	browser runner		required
samsung	browser runner	chrome-android		required