ConstReadonlyLOADER_END: "LoaderEnd"Dispatched when a loader finishes.
ReadonlyLOADER_ERROR: "LoaderError"Dispatched when a loader encounters an error.
ReadonlyLOADER_PROGRESS: "LoaderProgress"Dispatched when a loader makes progress.
ReadonlyLOADER_START: "LoaderStart"Dispatched when a loader starts.
Types of events dispatched by the engine.