This package provides a polyfill and ponyfill for the ES6 `Object.assign()` method, allowing it to be used in ECMAScript 5 environments that don't natively support it. It offers both manual and automatic polyfilling options, as well as a ponyfill that doesn't modify global objects. The library is primarily aimed at JavaScript developers who need to use `Object.assign()` in older environments or want to ensure compatibility across different JavaScript engines.