code: def register(self, library: str, cbl: Callable[['_AsyncLib'], None]):
          '''
          Registers a callable to set up a library.
          '''
          self._handlers[library] = cbf register(self, library: str, cbl: Callable[['_AsyncLib'], None]):
          '''
          Registers a callable to set up a library.
          '''
          self._handlers[library] = cbl
docs: Registers a callable to set up a library.