core-js

core-js is a modular standard library for JavaScript that provides polyfills for ECMAScript features, enabling modern JavaScript code to run in older browsers. It implements the latest ECMAScript specifications including Promise, Symbol, Iterator, Map, Set, and Array methods. The library is modular, allowing developers to import only the specific polyfills needed for their project to minimize bundle size. core-js is maintained by Denis Pushkarev and is one of the most widely used JavaScript libraries, included by default in tools like Babel. It supports a wide range of environments from Internet Explorer 11 to the latest browser versions. The library is regularly updated to include new ECMAScript proposals and features as they progress through the standardization process. core-js is essential for ensuring JavaScript applications work consistently across different browser environments.