text: const graphql     = require('graphql');
  const graphqlHTTP = require('express-graphql');
  const express     = require('express');
  const users       = require('./schema/userSchema');
  const app         = express();
  
  app.use('/user', graphqlHTTP({ schema: users, pretty: true }))
  
  app.listen(3000, function () {
      console.log('Server on.')
  })