Type 'string' is not assignable to type 'Subject<string>'-CodePudding

I am trying to implement some PDF Viewer

CodePudding user response：

You should return same data type.Try this method:

     base64Subject = new Subject<string>();
        //transform subject to observable
          $base64 = this.base64Subject.asObservable();
        //create a function to change subject value
        newBase64(base64:string){
            this.base64Subject.next(base64);
        }
    //Your ngOnInit function will be like this
      public ngOnInit(): void {
        this.httpClient.get(
            '/assets/pdfs/Bootstrap-vs-Material-Design-vs-Prime-vs-Tailwind.base64.txt',
            { responseType: 'text' as 'json' })
          .pipe(
            tap((base64) => (this.newBase64(base64.Data ""))),
          ).subscribe();
      }

// get base64 data from $base64 when there is a change

    this.$base64.subscribe((base64)=>console.log(base64))