examples/cms-prismic/lib/types.ts

import { Content } from "@prismicio/client";
import { ImageField, RelationField, TitleField } from "@prismicio/types";

export type PostDocumentWithAuthor = Content.PostDocument & {
  data: {
    author: AuthorContentRelationshipField;
  };
};

export type AuthorContentRelationshipField = RelationField<
  "author",
  string,
  {
    name: TitleField;
    picture: ImageField;
  }
>;