`documents` should be optional for backend-only projects

[lensbart]

Hello!

I’m setting up an API and wanted to use graphql-let because it look like "just what the doctor ordered".

However, I am both:

• unable to configure .graphql-let.yml without documents field
• unable to include documents: [] to meet this requirement

In my use case, I’m mainly interested in the QueryResolvers type to correctly type my resolvers.

Thanks!

[piglovesyou]

Hi @lensbart, thanks for pointing it out. We should definitely support your use-case though, the spec of Resolver Types is still unstable. Let me work on it on v0.19.0, I think it gets close after #60.