Apollo-server: Response not successful: Received status code 500 only after adding dataSources to ApolloServer

[AGurindapalli]

Link for the Code Repo
https://github.com/anilgurindapalli/apolloServer_RestDataSource
Response not successful: Received status code 500 only after adding dataSources to ApolloServer.

const server = new ApolloServer({ schema, dataSources: () => ({ randomUserAPI: new RandomUserDataSource() }) });
everything is working fine if i comment dataSouces.

[AGurindapalli]

Worked after updating Babel from 6.x to 7.x.
If anyone has the same issues you can check the repository for the working example of RestDataSource using ApolloServer

https://github.com/anilgurindapalli/apolloServer_RestDataSource.git

[kstulgys]

I had the same issue introspection: true solved the issue

const server = new ApolloServer({ .........., introspection: true })