inferSchema.js

import { makeAugmentedSchema, inferSchema } from 'neo4j-graphql-js';
import { ApolloServer } from 'apollo-server';
import { v1 as neo4j } from 'neo4j-driver';

// Create Neo4j driver instance 
const driver = neo4j.driver(
  process.env.NEO4J_URI || 'bolt://localhost:7687',
  neo4j.auth.basic(
    process.env.NEO4J_USER || 'neo4j',
    process.env.NEO4J_PASSWORD || 'letmein'
  )
);

// Connect to existing Neo4j instance, infer GraphQL typedefs
// generate CRUD GraphQL API using makeAugmentedSchema
const inferAugmentedSchema = driver => {
  return inferSchema(driver).then(result => {
    return makeAugmentedSchema({
      typeDefs: result.typeDefs
    });
  });
};

// Spin up GraphQL server using auto-generated GraphQL schema object
const createServer = schema =>
  new ApolloServer({
    schema
    context: { driver }
    }
  });

inferAugmentedSchema(driver)
  .then(createServer)
  .then(server => server.listen(3000, '0.0.0.0'))
  .then(({ url }) => {
    console.log(`GraphQL API ready at ${url}`);
  })
  .catch(err => console.error(err));