composeScene function
Expands every prefab instance in document, returning a new document with
no instance nodes. A document with no instances is returned unchanged.
resolve loads a referenced prefab document. A cyclic reference (a prefab
that instantiates itself, directly or transitively) is broken with a
warning rather than recursing forever.
Implementation
SceneDocument composeScene(
SceneDocument document, {
required PrefabResolver resolve,
}) => _compose(document, resolve, <String>{});