index.js

const { ApolloServer, gql } = require("apollo-server");

// Construct a schema, using GraphQL schema language
const typeDefs = gql`
  type Query {
    image: String,
    notImage: String
  }
`;

// Provide resolver functions for your schema fields
const resolvers = {
  Query: {
    image: () =>
      "https://uploads.codesandbox.io/uploads/user/8d35d7c1-eecb-4aad-87b0-c22d30d12081/l2nh-cat.jpeg",
    notImage: () => "https://unsplash.com/search/photos/cat"
  }
};

const server = new ApolloServer({ typeDefs, resolvers });

server.listen().then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});