zloirock/core-js

Core-js is a modular standard library for JavaScript, providing polyfills for ECMAScript features (up to 2025) and web standards. It's designed for developers who need to support older browsers or environments that lack modern JavaScript features, allowing them to use the latest syntax and functionality without compatibility issues. Core-js is highly customizable, letting you include only the features you need to minimize bundle size and avoid polluting the global namespace.