Apollo Server REST Directive

rest-directive.js

const { 
  ApolloServer,
  gql,
  SchemaDirectiveVisitor
} = require('apollo-server');
const fetch = require('node-fetch');

const typeDefs = gql`
  directive @rest(url: String) on FIELD_DEFINITION

  type Query {
    users: [User] @rest(url: "https://jsonplaceholder.typicode.com/users")
  }

  type User {
    id: Int
    name: String
    username: String
    email: String
  }
`;

class RestDirective extends SchemaDirectiveVisitor {
  visitFieldDefinition(field) {
    const { url } = this.args;
    field.resolve = () => {
      const res = fetch(url)
        .then(resp => resp.json())
      return res; 
    };
  }
}

const server = new ApolloServer({
  typeDefs,
  schemaDirectives: {
    rest: RestDirective
  }
});

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