Graphql Service Class

class GraphqlResponse {
  final bool success;
  final data;
  GraphqlResponse({required this.success, required this.data});
}

class GraphqlService {
  GraphqlService._privateConstructor();
  static final GraphqlService _instance = GraphqlService._privateConstructor();
  static GraphqlService get instance => _instance;


  Uri url = Uri.parse('http://localhost:3000/graphql');

  sendRequest(String query, Map variables) async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    var response = await http.post(
      url, 
      headers: {
         "Content-Type": "application/json",
          "Accept": "application/json",
          "token": preferences.getString('token').toString()
      },
      body: jsonEncode({"query": query, "variables": variables}),
    );
    var data = jsonDecode(response.body);
    print(data);
    if(data['data'] != null){
      return GraphqlResponse(data: data['data'], success: true);
    }else{
      return GraphqlResponse(data: ['errors'][0], success: false);
    }
  }




}