If the GraphQL interface name matches the CMS content type name exactly, the default resolver automatically resolves content of that type to the GraphQL object type whose name is the interface name with an Impl suffix appended. If no such GraphQL type is found, it walks up the CMS content type parent hierarchy until a matching GraphQL *Impl type is found.

To add a custom GraphQL type and interface that maps to the content type CustomArticle, add the following to the GraphQL schema:

interface CustomArticle @inherit(from: ["CMTeasable"]) {
  text: String
}

type CustomArticleImpl implements CustomArticle @inherit(from: ["CMTeasableImpl"]) {
  text: String @fetch(from: "text")
}

The built-in contentTypeNameResolver resolves content of type CustomArticle to __typename: "CustomArticleImpl".