Subscribe will be deprecated. The example I have seen on the RxJS website don’t really use any observers. If I remove subscribe from the following code, I get “error TS2349: This expression is not callable. [ng] Type ‘Observable’ has no call signatures.”

if (this.postData.token) {
    this.feedService.feedData(this.postData).subscribe(
      (res: any) => {
       this.feedService.changeFeedData(res.feedData);
        },
        (error: any) => {
          this.toastService.presentToast('Error!');
        }
      );
    }