Promise.resolve()

The Promise.resolve() static method “resolves” a given value to a Promise. If the value is a promise, that promise is returned; if the value is a thenable, Promise.resolve() will call the then() method with two callbacks it prepared; otherwise the returned promise will be fulfilled with the value.

This function flattens nested layers of promise-like objects (e.g., a promise that fulfills to a promise that fulfills to something) into a single layer — a promise that fulfills to a non-thenable value.

Promise.resolve() resolves a promise, which is not the same as fulfilling or rejecting the promise. See Promise description for definitions of the terminology. In brief, Promise.resolve() returns a promise whose eventual state depends on another promise, thenable object, or other value.

Syntax example: Promise.resolve(value)