use file-saver to open file

openFile.js

 //   private getFileNameFromContentDisposition(res: FileDownloadResponse<Blob>) {
    //     const { contentDisposition } = res;
    //     const matches = /filename=([^;]+)/gi.exec(contentDisposition);
    //     const tempFilename = ((matches && matches[1]) || 'untitled').trim();
    //     const filename = tempFilename.replace(/["]/g, '');
    //     return filename;
    // }

    // static openFile(response: FileDownloadResponse<Blob>) {
    //     if (response && response.body) {
    //         const { contentType } = response;
    //         const filename = FileDownloadHelper.getFileNameFromContentDisposition(response);
    //         saveAs(new Blob([response.body], { type: contentType }), filename);
    //     }
    // }

}