[desktop_drop] Exporting 'events.dart' request

I was working on drop zone highlighting. I used a raw drop event listener to change the widget state when the user starts dragging a file over the application. I had to import a file from the src directory to complete my task.

//Linter message: Import of a library in the 'lib/src' directory of another package. (Documentation)
import 'package:desktop_drop/src/events.dart';
...
  @override
  void initState() {
    DesktopDrop.instance.addRawDropEventListener(_onDropEvent);
    ...
    super.initState();
  }

  @override
  void dispose() {
    DesktopDrop.instance.removeRawDropEventListener(_onDropEvent);
    ...
    super.dispose();
  }

  void _onDropEvent(DropEvent event) {
    if (_dropSubject.value && (event is DropDoneEvent || event is DropExitEvent)) {
      _dropSubject.add(false);
    } else if (!_dropSubject.value && event is DropEnterEvent) {
      _dropSubject.add(true);
    }
  }

Start by reading src/events.dart and the desktop_drop package's public entry point to understand how its event types are exposed. Make the event API available without importing the package's src directory, then verify the package's existing analysis or test checks pass.