core-js is a npm component included in the Tidelift Subscription

Tidelift is working with the maintainers of core-js and thousands of other projects to provide application development teams with customizable catalogs of known-good, proactively maintained open source.

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core-js is a part of the Tidelift Subscription

About core-js

npm core-js is a modular standard library for JavaScript. npm-core-js includes polyfills for ECMAScript up to 2019: promises, symbols, collections, iterators, typed arrays, many other features, ECMAScript proposals, some cross-platform WHATWG / W3C features and proposals like URL. You can load only required features or use it without global namespace pollution.

According to npm, core-js has over 15 million downloads a week and has over 16,000 projects depending on it.

The maintainers of core-js and the maintainers of thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use.

You can learn more about core-js on the project repo.