could not add custom dateTime about grand-stack-starter HOT 3 OPEN

import { ApolloServer, makeExecutableSchema } from "apollo-server";
import { v1 as neo4j } from "neo4j-driver";
import { makeAugmentedSchema, augmentTypeDefs } from "neo4j-graphql-js";
import dotenv from "dotenv";

import { DateTime, DateTimeScalar} from "@okgrow/graphql-scalars"

// set environment variables from ../.env
dotenv.config();

/*
 * Create an executable GraphQL schema object from GraphQL type definitions
 * including autogenerated queries and mutations.
 * Optionally a config object can be included to specify which types to include
 * in generated queries and/or mutations. Read more in the docs:
 * https://grandstack.io/docs/neo4j-graphql-js-api.html#makeaugmentedschemaoptions-graphqlschema
 */


const schema = makeExecutableSchema({
  typeDefs: [
    DateTimeScalar, augmentTypeDefs(typeDefs)
  ],
  resolverValidationOptions: {
    requireResolversForResolveType: false
  },
  resolvers: {
    DateTime,
  },
});

const augmentedSchema = makeAugmentedSchema({
  schema: schema,
  //typeDefs: typeDefs

});

/*
 * Create a Neo4j driver instance to connect to the database
 * using credentials specified as environment variables
 * with fallback to defaults
 */
const driver = neo4j.driver(
  process.env.NEO4J_URI || "bolt://localhost:7687",
  neo4j.auth.basic(
    process.env.NEO4J_USER || "neo4j",
    process.env.NEO4J_PASSWORD || "neo4j"
  )
);

/*
 * Create a new ApolloServer instance, serving the GraphQL schema
 * created using makeAugmentedSchema above and injecting the Neo4j driver
 * instance into the context object so it is available in the
 * generated resolvers to connect to the database.
 */
const server = new ApolloServer({
  context: { driver },
  schema: augmentedSchema
});

server.listen(process.env.GRAPHQL_LISTEN_PORT, "0.0.0.0").then(({ url }) => {
  console.log(`GraphQL API ready at ${url}`);
});