How to await inside RxJS subscribe method

you can just directly add async signature to the anonymous function call in subscribe

 this.subscriber = dateSubscription.subscribe(async (date: Date) => {    let dbKey = await this._someService.saveToDatabase(someObject);    // wait for db write to finish before evaluating the next code    // ... some other code here  });

You do not need to use await, nor need to convert your Promise to an Observable.

Here's an example with a mock for the function saveToDatabase :
(and the working Plunkr : https://plnkr.co/edit/7SDLvRS2aTw9gYWdIznS?p=preview)

const { Observable } = Rx;const saveToDatabase = (date) =>  new Promise(resolve =>    setTimeout(() =>      resolve(`${date} has been saved to the database`),      1000));const date$ = Observable.of(new Date()).delay(1000);date$  .do(x => console.log(`date received, trying to save it to database ...`))  .switchMap(date => saveToDatabase(date))  .do(console.log)  .subscribe();

Output :

Update:Found easy for one time promises just use toPromise in front of the subscriber (blog). So for the above case it will be like this:

const title = await this.translate.get('MYBOOK-PAGE.PAGE_TITLE').toPromise();

Old way:Here's my method of solving this issue

const title = await new Promise<string>(resolve =>   this.translate.get('MYBOOK-PAGE.PAGE_TITLE')   .subscribe(translated => {     resolve(translated)   }));

Here what I'm doing is changing my Observable to a Promise

Note: Here the only problem is this is one time show ie. if you subscribe once you won't able to access it again. Suited me so sharing here.