Function downloadFilePromise

downloadFilePromise(requestUrl: string, filename?: string): Promise<void>
Downloads a file from the given URL and saves it with the specified filename, returning a promise.
Parameters
- requestUrl: string
  The URL to request the file from.
- Optionalfilename: string
  The filename to save the file as. If not provided, it tries to use the filename from the content-disposition header or defaults to "missing_filename".
Returns Promise<void>
- A promise that resolves when the file is successfully downloaded or rejects if there is an error.
Example
```
downloadFilePromise("https://example.com/file.pdf", "downloaded_file.pdf")
  .then(() => {
    console.log("File downloaded successfully");
  })
  .catch((e) => {
    console.error("Failed to download file", e);
  });
```
- Defined in utils/file/index.ts:76