isPromise

Checks if a given value is Promise.

This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to Promise.

Signature

function isPromise(value: unknown): value is Promise<any>;

Parameters

• value (unknown): The value to check if it is a Promise.

Returns

(value is Promise<any>): Returns true if value is a Promise, else false.

Examples

const value1 = new Promise((resolve) => resolve());
const value2 = {};
const value3 = 123;

console.log(isPromise(value1)); // true
console.log(isPromise(value2)); // false
console.log(isPromise(value3)); // false