StackFormation\Observer::deleteOnSignal PHP Method

    public function deleteOnSignal()
    {
        $terminator = new Terminator($this->stack, $this->output);
        $terminator->setupSignalHandler();
        return $this;
    }

 protected function executeWithStack(Stack $stack, InputInterface $input, OutputInterface $output)
 {
     $observer = new Observer($stack, $this->getStackFactory(), $output);
     if ($input->getOption('deleteOnTerminate')) {
         $observer->deleteOnSignal();
     }
     return $observer->observeStackActivity();
 }