1. @DomName('WorkerGlobalScope.close')
  2. @DocsEditable()
  3. @Experimental()
void close()

Source 

@DomName('WorkerGlobalScope.close')
@DocsEditable()
@Experimental() // untriaged
void close() =>
    _blink.BlinkWorkerGlobalScope.instance.close_Callback_0_(this);