Response not successful: Received status code 500 when using `datasources`

Question

Here's my server setup:

const server = new ApolloServer({
  typeDefs,
  resolvers,
  dataSources: () => ({
    movieAPI: new MovieAPI()
  }),
  context: {
    hello: `world`
  }
});

server
  .listen({ port: 4000 })
  .then(({ url }) => console.log(`🚀 app running at ${url}`));

If I remove datasources everything works fine, otherwise I get an error in graphql playground "error": "Response not successful: Received status code 500"

I'm doing this Apollo Server tutorial but I have some babel config so I can use es6 syntax.

Here is my repo

Answer 1

adding introspection: true solved the issue