Function isPromise

tfjs-core/src/util_base.ts:739–747

(object: any)

 */
// tslint:disable-next-line: no-any
export function isPromise(object: any): object is Promise<unknown> {
  //  We chose to not use 'obj instanceOf Promise' for two reasons:
  //  1. It only reliably works for es6 Promise, not other Promise
  //  implementations.
  //  2. It doesn't work with framework that uses zone.js. zone.js monkey
  //  patch the async calls, so it is possible the obj (patched) is
  //  comparing to a pre-patched Promise.
  return object && object.then && typeof object.then === 'function';
}