The repository provides a tiny polyfill for JavaScript’s `Promise.defer` (often called a *Deferred* object), letting developers create a pair of linked objects—one that can be resolved or rejected later and the other that yields a Promise. It works with the native ES6 `Promise` when available but can also wrap any Promises‑A+ compatible implementation, making it useful for both modern browsers and older environments where deferred‑style APIs are needed. It’s aimed at developers who need a reliable, dependency‑free way to create controllable asynchronous promises in JavaScript.