javascript: graphql

buildSchema.js

const { graphql, buildSchema } = require('graphql');

const schema = buildSchema(`
  type Query {
    hello: String,
  }
`);
const query = '{ hello }';
const resolver = { hello: () => 'Hello world!' }

graphql(schema, query, resolver).then(console.log);

GraphQLSchema.js

const {
  graphql,
  GraphQLSchema,
  GraphQLObjectType,
  GraphQLString
} = require('graphql');

const schema = new GraphQLSchema({
  query: new GraphQLObjectType({
    name: 'RootQueryType',
    fields: {
      hello: {
        type: GraphQLString,
        resolve() {
          return 'world';
        }
      }
    }
  })
});

var query = '{ hello }';

graphql(schema, query).then(console.log);