basic_types.js

const express = require("express");
const { graphqlHTTP } = require("express-graphql");
const { buildSchema } = require("graphql");

const schema = buildSchema(`
type Starship {
  id: ID!
  name: String!
}
type Query {
  quoteOfTheDay: String
  random: Float!
  rollThreeDice: [Int]
  getStarship: Starship!
}
`);

const root = {
  quoteOfTheDay: () => {
    return Math.random() < 0.5 ? "Take it easy" : "Salvation lies within";
  },
  random: () => {
    return Math.random();
  },
  rollThreeDice: () => {
    return [1, 2, 3].map((_) => 1 + Math.floor(Math.random() * 6));
  },
  getStarship: () => {
    return { id: 1, name: "emma" };
  },
};

const app = express();
app.use(
  "/graphql",
  graphqlHTTP({
    schema: schema,
    rootValue: root,
    graphiql: true,
  })
);
app.listen(4000);
console.log("Running a GraphQL API server at http://localhost:4000/graphql");