Types are not generated for introspection query

[danielkcz]

Describe the bug
I have a query like this which reads introspection in runtime to figure user permissions. Unfortunately, the generated types do not include the GUserPermissions type at all. But if I add something else to that query, it appears there, but without the introspection part.

export const UserPermissionsQuery = gql`
  query GUserPermissions {
    __schema {
      queryType { fields { name } }
      mutationType { fields { name } }
    }
  }
`

To Reproduce
I am using API approach and call it like this. Full introspection is generated in JSON file. I've checked and it includes types for __schema, so that should be a problem.

  generate({
    schema: jsonPath,
    out: './src/graph/types.ts',
    template: 'graphql-codegen-typescript-template',
    args: ['./src/**/*graphql.ts'],
    skipSchema: true,
    overwrite: true,
  })

Expected behavior
To have TypeScript types based on introspection query.

Environment:

• OS: Windows 10 x64
• Codegen: 0.9.2
• Node: 10.11.0

[dotansimha]

Interesting. Thanks @FredyC !

I think we might ignore fields that starts with __. I'll check.

[dotansimha]

@FredyC We are ignoring the internal fields of GraphQL because otherwise it will bloat the results (see https://github.com/dotansimha/graphql-code-generator/blob/master/packages/graphql-codegen-core/src/schema/schema-to-template-context.ts#L27) .

I can make this filtering an option, and then it will solve your issue.

[patricknazar]

I've noticed that when I use simply a __typename in fragment, I get similar issues:

fragment MyFragment on MyType {
    ... on TypeOne {
        __typename
    }
}

gives me:

export namespace MyFragment {

    export type TypeOneInlineFragment =

}

Notice the trailing =. Will this resolve this problem too? It's not an introspection query really is it? It is an internal field, right?

[Jonatthu]

@dotansimha I am having the same issues on the latest version, I really need to do some internal types queries

[kamilkisiela]

I tried to fix it in #1380, could you guys check if that works in your projects? A canary release under 0.18.0-alpha.d365409c, make sure you bump all packages from codegen group.

[dotansimha]

Fixed in 0.18.0 🎉