[ 源代码： node-core-js ]
软件包：node-core-js-pure（3.26.1-3）
Modular standard library for JavaScript without global namespace pollution
Includes polyfills for ECMAScript up to 2021: promises, symbols, collections, iterators, typed arrays, ECMAScript 7+ proposals, setImmediate, etc. Some additional features such as dictionaries or extended partial application. Use core-js-pure to require only needed features or use it without global namespace pollution.