step 6 : add package graphql, configure base repo, constant, graph provider.dart

lib/provider/dio_provider.dart

@@ -0,0 +1,4 @@
+import 'package:dio/dio.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+final dioProvider = Provider<Dio>((ref) => Dio());

lib/provider/graphql_provider.dart

@@ -0,0 +1,22 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:graphql/client.dart';
+
+import '../app/constant.dart';
+
+final graphqlProvider = Provider.family<GraphQLClient, String>(
+  (_, token) {
+    return GraphQLClient(
+      link: (token != "")
+          ? HttpLink(
+              Constant.baseURLGraphQl,
+              defaultHeaders: {
+                'Authorization': 'Bearer $token',
+              },
+            )
+          : HttpLink(
+              Constant.baseURLGraphQl,
+            ),
+      cache: GraphQLCache(),
+    );
+  },
+);