raptor-polyfill is a JavaScript library that provides polyfills for various EcmaScript 5 and EcmaScript 6 methods, distributed as CommonJS modules that can be required individually or as a whole. It is designed for use with CommonJS module bundlers like RaptorJS Optimizer, allowing developers to ensure compatibility with older JavaScript environments by adding missing functionality. The project is particularly useful for developers working with legacy browsers or environments that lack support for modern JavaScript features.