is-promise

is-promise is a minimalist utility that determines if an object adheres to the Promises/A+ specification by duck-typing, specifically checking for the presence and function type of a `then` method. The package is currently at version 4.0.0, which primarily introduced a breaking change for TypeScript users regarding `PromiseLike` inference. While it doesn't follow a strict, rapid release cadence, major versions address significant compatibility updates, particularly concerning module resolution in Node.js environments and TypeScript definitions. Its key differentiator is its small footprint and focused API, providing a reliable and agnostic way to identify promise-like objects, useful in contexts where various promise implementations or thenables might be encountered, without relying on a global `Promise` constructor.