Base schema (schema extensions) and Schema Stitching project not working

[rickardgranberg]

I'm having trouble using the Base Schema/Schema Exension part of Hive, with a Schema Stitching project

I want to use it to define some custom directives, as well as some shared scalars and types.
As an example, I add this to the Base Schema and hit save:

directive @mycustom on FIELD_DEFINITION
scalar DateTime

With a schema like (the rest omitted for brevity):

type User {
    id: ID!
    created: DateTime!
    name: String! @mycustom
}

I get errors both from hive schema:check and hive schema:publish :

✖ Detected 2 errors

   - Unknown directive @mycustom.
   - Unknown type DateTime.

If I create a Monolithic Schema project, I can publish just fine with the same inputs. hive schema:check does however give me the same error in both project types.

Am I doing something wrong?