Error object undefined in Angular project built version

Question

I'm handing errors in my Angular app using RxJS like this:

  public downloadInClient(fileName: string) {
    return (source: Observable<Blob>) =>
      source.pipe(
        map((blob: Blob) => {
          this.downloadPDF(blob, fileName);
          return blob;
        }),
        catchError((error: any) => {
          console.error(error);
          this.handleError(error);
          return EMPTY;
        }),
      );
  }

Any idea why in local I can see the object error with its fields when an error is caught, but after building and deploying the app, the error is caught in the correct place but when console.error it, is shows itself as undefined?

I have tried to frame all inside a try catch, but because the error is caught before, inside the catchError, the code doesn't arrive to the outside catch.

please share the minimal reproducible code, how are you using downloadInClient — Naren Murali
– Naren Murali, Commented May 6 at 14:04

Rohan Kumar · Accepted Answer · 2025-05-06 16:43:59Z

Might be you are not giving the source correctly. If you have a fileName in your function then there should be server call to get the content from backend. May be below code in your main function will help you.

return this.http.get(url+fileName, {
  responseType: 'blob',
  headers: new HttpHeaders().append('Content-Type', 'application/pdf'),
  params: new HttpParams()
}).pipe(
  map((source: Blob) => {
    // to download the file
    const blob = new Blob([source], { type: 'application/pdf' });
    const downloadLink = document.createElement('a');
    downloadLink.href = URL.createObjectURL(blob);
    downloadLink.download = fileName;
    downloadLink.click();
    URL.revokeObjectURL(downloadLink.href);
    return source;
  }),
  catchError((error: any) => {
    console.error(error);
    this.handleError(error);
    return EMPTY;
  }),
);

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