chore: Integrate graphql to the express app

packages/backend/src/app.ts

@@ -1,10 +1,12 @@
 import appConfig from './config/app'
 import createError from 'http-errors';
 import express, { Request, Response, NextFunction } from 'express';
+import { graphqlHTTP } from 'express-graphql';
 import logger from './helpers/logger';
 import morgan from './helpers/morgan';
 
-import indexRouter from './routes/index';
+import rootResolver from './graphql/root-resolver'
+import graphQLSchema from './graphql/graphql-schema'
 
 const app = express();
 const port = appConfig.port;
@@ -13,7 +15,14 @@ app.use(morgan);
 app.use(express.json());
 app.use(express.urlencoded({ extended: false }));
 
-app.use('/', indexRouter);
+app.use(
+  '/graphql',
+  graphqlHTTP({
+    schema: graphQLSchema,
+    rootValue: rootResolver,
+    graphiql: true,
+  }),
+);
 
 // catch 404 and forward to error handler
 app.use(function(req: Request, res: Response, next: NextFunction) {