Function isPromise

packages/jest-util/src/isPromise.ts:8–16

(
  candidate: unknown,
)

 */

export default function isPromise<T = unknown>(
  candidate: unknown,
): candidate is PromiseLike<T> {
  return (
    candidate != null &&
    (typeof candidate === 'object' || typeof candidate === 'function') &&
    typeof (candidate as any).then === 'function'
  );
}