SaraVieira

const { RESTDataSource } = require("apollo-datasource-rest");

class RandomUser extends RESTDataSource {
  constructor() {
    super();
    this.baseURL = "https://randomuser.me/api/";
  }
}

module.exports = RandomUser;

SaraVieira

const typeDefs = gql`
  type Name {
    title: String,
    first: String,
    last: String,
  }

  type Location {
    street: String
    city: String

SaraVieira

const typeDefs = gql`
  scalar Image

  type Query {
    image: Image,
    notImage: Image
  }
`;    

SaraVieira

const resolvers = {
  Image: Image,
  Query: {
    image: () =>
      "https://uploads.codesandbox.io/uploads/user/8d35d7c1-eecb-4aad-87b0-c22d30d12081/l2nh-cat.jpeg",
    notImage: () => "https://codesandbox.io/s/4qlo54l7k9"
  }
};

SaraVieira

const isImage = value => {
  if (typeof value !== "string") throw new GraphQLError("Value passed is not a string");
  const extension = path.extname(value).slice(1);

  if (imageExtensions.includes(extension)) return value;

  throw new GraphQLError("Value passed is not an Image");
};

SaraVieira

const Image = new GraphQLScalarType({
  name: "Image",
  description: "An Image Scalar",
  serialize: value => isImage(value)
});

SaraVieira

const path = require("path");
const imageExtensions = require("image-extensions");

const isImage = value => {
  if (typeof value !== "string") return null;
  
  const extension = path.extname(value).slice(1);
  if (imageExtensions.includes(extension)) return value;

  return null

SaraVieira

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

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

SaraVieira

  "scripts": {
    "start": "nodemon index.js localhost 4000"
  },

SaraVieira

npm i apollo-server graphql nodemon
# yarn add apollo-server graphql nodemon