future-unwrap-in-flutter.dart

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import 'dart:async';
import 'dart:io';
import 'package:image_picker/image_picker.dart';

extension Unwrap<T> on Future<T?> {
  Future<T> unwrap() => then(
        (value) => value != null 
          ? Future<T>.value(value) 
          : Future.any([]),
      );
}

@immutable
class ImagePickerHelper {
  static final ImagePicker _imagePicker = ImagePicker();
  static Future<File> pickImageFromGallery() => _imagePicker
      .pickImage(source: ImageSource.gallery)
      .unwrap()
      .then((xFile) => xFile.path)
      .then((filePath) => File(filePath));
}