是否忽略了Promise中的Await？

Question

我在下面有一个简单的函数，您可以在其中传递一个String作为参数，该参数将基于Firestore子集合查询返回一个Promise，该Promise将只解析为空对象或填充的对象。

问题是即使我对前一条语句调用了await，最后一个resolve({})也被调用了，可能会发生什么？

getSubCollections = (id: string): Promise<any> => {
    const subCollectionPromise = new Promise(async (resolve: Function) => {
      if (typeof this.subCollectionKeys === 'undefined') {
        resolve({});
      }

      const collections = {};

      await this.subCollectionKeys.forEach(async (key: string) => {
        const subCollection = await this.getCollection()
          .doc(id)
          .collection(key)
          .get();
        const firebaseObj = await subCollection.docs.map((obj: Object) =>
          this.getShallowData(obj),
        );
        const fromFirebase = fromFirebaseObj(firebaseObj);

        if (!fromFirebase.empty) {
          collections[key] = fromFirebase;
        }
        resolve(collections);
      });

     resolve({}); /// WHY IS THIS CALLED EVEN IF THERE IS AWAIT ON TOP???
    });

    return subCollectionPromise;
  };