core-js - Standard Library

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It's documentation for the unstable core-js@3, if you looking documentation for core-js@2, please, check this branch. Modular standard library for JavaScript. Includes polyfills for ECMAScript 5, 2015, 2016, 2017: promises, symbols, collections, iterators, typed arrays, many other features, ECMAScript proposals, some cross-platform WHATWG / W3C ECMAScript-related features and proposals like setImmediate. You can load only required features or use it without global namespace pollution.

https://github.com/zloirock/core-js

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