Solution for your Errors and Exceptions

RangeError: Maximum call stack size exceeded when using valueChanges.subscribe public  tokenAcquired: BehaviorSubject<any> =  new  BehaviorSubject<any>( '' ); //from where you want to trigger the subscription this .appService.tokenAcquired.next(tokenStored.accessToken); //where you are subscribing this .appService.tokenAcquired.pipe(     distinctUntilChanged())  // it will emit if value is different then last     .subscribe((token)  =>  {        if  ( this .debugMode) {         console.log( "token acquired and calling getApps." );       }        this .getApps();     })