backstage/.changeset/strong-dolphins-turn.md

@backstage/catalog-model

@backstage/catalog-model
minor

BREAKING: The User kind has an updated TypeScript type where spec.memberOf is optional.

NOTE HOWEVER, that this only applies to the TypeScript types UserEntity and UserEntityV1alpha1. The catalog validation still requires the field to be set, even if it's in the form of an empty array. If you try to ingest data that stops producing this field, those entities will be rejected by the catalog. The reason for these choices is that consumers will get a long grace period where old code still can rely on the underlying data being present, giving users ample time to update before actual breakages could happen.