error_handler_stream.dart

import 'package:dio/dio.dart';
import 'package:error_handler/error_handler.dart';
import 'post.dart';

/// first create [Dio] api call
FutureResponse<Post> getPost() async {
  const path = "https://jsonplaceholder.typicode.com/posts/1";

  final response = await Dio().get(path);
  return response.convert(Post.fromJson);
}

/// wrap the api call with [ErrorHandler.stream]
///
/// to handle loading state
void main() {
  final event = errorHandler.stream(getPost);

  event.listen((state) {
    state.whenOrNull(
      loading: () {
        print("loading");
      },
      data: (post, response) {
        print("title: ${post.title}");
      },
      error: (error) {
        print(getErrorMessage(error));
      },
    );
  });
}