Send errors on PUT after stream is returned

[bredar]

We have to do some actions, after a file is uploaded. This actions can fail. How to send an error to WebDAV in this case?

protected _openWriteStream(
		path: WebDav.Path,
		ctx: WebDav.OpenWriteStreamInfo,
		callback: WebDav.ReturnCallback<Writable>
	): void {
      const  stream = createWriteStream('c:\upload', 'binary'); 
      stream.on('finish', async () => {
          // move file and stuff
          // -> how to raise an error so http 500 is sent?
     }
     callback(undefined, stream);
);

[ViktorMasnyi]

@bredar try to pass the instance of Error as first argument of callback:
callback(error, stream)

[bredar]

Problem is, first we do need to return the stream to allow uploading. Therefore the callback without the error was called already. The potential error we need to catch and return is after that, in the finish section. Calling the callback again with an error does not have an effect.

[ImmaB]

This makes it impossible to handle errors or is there any way to work around this?