description

# file method

1. @JSName.new('file')

Future<File> file()

## Implementation

    @JSName('file')
    Future<File> file() {
      var completer = new Completer<File>();
      _file(
        (value) {
          applyExtension('File', value);
          completer.complete(value);
        },
        (error) {
          completer.completeError(error);
        },
      );
      return completer.future;
    }