Method then

packages/zone.js/test/common/Promise.spec.ts:152–154

(onFulfilled: any, onRejected: any)

        }

        override then(onFulfilled: any, onRejected: any) {
          return this.sub.then(onFulfilled, onRejected);
        }
      }
      const p = Promise.resolve(1);
      new MyPromise(p).then(