apollo-tooling

If you use Apollo as your GraphQL client, there's apollo-codegen [0], which supports generating both Flow and TypeScript type definitions. Relay Modern's query compiler also generates Flow types AFAIK. But that's only for the client side. I suppose if you'd like to use typed JavaScript on the server side, something like the library you've posted might be your best bet, since client side solutions like apollo-codegen generate types based on the exact set of queries in your client-side app, which might not be all that useful for implementing the GraphQL server itself (unless maybe your API is private and you can afford to implement some form of persisted queries?). Having access to all the individual base types specified in your schema would probably be more useful for that purpose. [0] https://github.com/apollographql/apollo-codegen