getUnsafe<T extends Object>  method 
Retrieves a dependency unsafely, returning the instance or a future of it, or throwing an error if not found.
Implementation
@pragma('vm:prefer-inline')
FutureOr<T> getUnsafe<T extends Object>({
  Entity groupEntity = const DefaultEntity(),
  bool traverse = true,
}) {
  assert(T != Object, 'T must be specified and cannot be Object.');
  UNSAFE:
  return get<T>(
    groupEntity: groupEntity,
    traverse: traverse,
  ).unwrap().unwrap();
}