public downloadBlob(fileName: string, blob: Blob): void {
  if (window.navigator.msSaveOrOpenBlob) {
    window.navigator.msSaveBlob(blob, fileName);
  } else {
    const anchor = window.document.createElement('a');
    anchor.href = window.URL.createObjectURL(blob);
    anchor.download = fileName;
    document.body.appendChild(anchor);
    anchor.click();
    document.body.removeChild(anchor);
    window.URL.revokeObjectURL(anchor.href);
  }
}