Promiseを外からresolveする

TypeScript

aaaaaaaaaの10秒後にbbbbbbbbbが出力されます↓

class DeferredPromise{
    promise:Promise<any>
    resolve:Function
    reject:Function
    constructor(){
        this.promise = new Promise((_resolve, _reject)=> {
            this.resolve = _resolve
            this.reject = _reject
        })
    }
}

var deferred = new DeferredPromise()

setTimeout(()=> {
    deferred.resolve()
}, 10000)

Promise.resolve().then(()=> {
    console.log('aaaaaaaaa')
}).then(()=> {
    return deferred.promise
}).then(()=> {
    console.log('bbbbbbbbb')
})

JavaScript

ちなみにコンパイル後↓

var DeferredPromise = (function () {
      function DeferredPromise() {
          var _this = this;
          this.promise = new Promise(function (_resolve, _reject) {
              _this.resolve = _resolve;
              _this.reject = _reject;
          });
      }
      return DeferredPromise;
})();
var deferred = new DeferredPromise();
setTimeout(function () {
      deferred.resolve();
}, 10000);
Promise.resolve().then(function () {
      console.log('aaaaaaaaa');
}).then(function () {
      return deferred.promise;
}).then(function () {
      console.log('bbbbbbbbb');
});

参考にした記事
よく見たらPromiseの本にも書いてあった