test.ts

loadDocument(name: string) {
  // Call HTTP GET with the name of the document as a query parameter
  this.http.get<DocumentData>('/document/load', {
    params: {
      name: name
    }
  }).subscribe(
    (result) => {
      this.selectedDocument = result;

      let streamType = TXTextControl.StreamType.InternalUnicodeFormat;

      switch (this.selectedDocument.name.split('.').pop()) {
        case 'docx':
          streamType = TXTextControl.StreamType.WordprocessingML;
          break;
        case 'rtf':
          streamType = TXTextControl.StreamType.RichTextFormat;
          break;
        case 'doc':
          streamType = TXTextControl.StreamType.MSWord;
          break;
      }

      TXTextControl.loadDocument(streamType, this.selectedDocument.data, () => {
        TXTextControl.setEditMode(1);
      });
    },
    (error) => {
      console.error(error);
    }
  );
}