@typed/is-promise/src/index.ts

Check if a value is a Promise

export function isPromise<T>(p: any): p is Promise<T>;
export function isPromise(p: any): p is Promise<any>;

export function isPromise<T>(p: any): p is Promise<T> {
  return p !== null && typeof p === 'object' && typeof p.then === 'function';
}