api top-level constant

Annotate class as api that holds server requests

@api
class PostsApi {
  HttpRequest<List<Post>> getPosts(int offset, int limit) => HttpRequest<List<Post>>()
    ..method = RequestMethod.get
    ..baseUrl = getBaseUrl(BackendUrls.main)
    ..url = '/posts'
    ..parser = (result, headers) async {
      final list = <Post>[];

      result?.forEach((data) {
        list.add(Post.fromJson(data));
      });

     return list;
   };
}