EMBEDDED_DOCUMENT_TYPES: readonly [
    "ActiveEffect",
    "ActorDelta",
    "AmbientLight",
    "AmbientSound",
    "Card",
    "Combatant",
    "CombatantGroup",
    "Drawing",
    "Item",
    "JournalEntryCategory",
    "JournalEntryPage",
    "MeasuredTemplate",
    "Note",
    "PlaylistSound",
    "Region",
    "RegionBehavior",
    "TableResult",
    "Tile",
    "Token",
    "Wall",
] = ...

The embedded Document types.