`GraphQLNonNull` & `GraphQLID` not being imported on Mutation generator

[lucasbento]

We need to improve this: https://github.com/lucasbento/create-graphql/blob/master/packages/generator/src/mutation/index.js#L32-L51

[sibelius]

Can't we generate all that needs to be imported automatically?

[lucasbento]

@sibelius: no because some mutations might not need those types to be imported.

E.g. mutations without any required fields.

[sibelius]

that's why I said automatically

automatically -> detect which types are being used and then import them

[lucasbento]

That's what this is supposed to do but doesn't seem to be doing its job so well.

[sibelius]

add a test case