src/vs/workbench/services/workingCopy/common/storedFileWorkingCopy.ts/isStoredFileWorkingCopySaveEvent
export function isStoredFileWorkingCopySaveEvent(e: IWorkingCopySaveEvent): e is IStoredFileWorkingCopySaveEvent {
	const candidate = e as IStoredFileWorkingCopySaveEvent;

	return !!candidate.stat;
}