A development-time component to watch for Esc and quit playing a Unity game

QuitAppOnEscape.cs

// QuitAppOnEscape.cs
//
using UnityEngine;
#if ENABLE_INPUT_SYSTEM
using UnityEngine.InputSystem;
#endif

namespace Screenplay.Workbench
{
    //
    // Throw this on any always-present game object such as Main Camera
    // in any generic super-simple apps for deployment on Android or
    // Standalone.
    //
    // Unity has two input handling setups.
    //  - the "old" Input manager setup
    //  - the "new" InputSystem setup
    //
    // This class uses the new InputSystem if it has been enabled.
    //
    // Project Settings >
    //   Player >
    //     Other Settings >
    //       Configuration >
    //         Active Input Handling =
    //           Both | InputSystem(New) | InputManager(Old)
    //
    public class QuitAppOnEscape: MonoBehaviour
    {
        [Tooltip("If true, Quit works in built apps outside editor too.")]
        public bool standalone = false;

        void Awake()
        {
#if UNITY_EDITOR
            if (UnityEditor.EditorApplication.isPlaying)
                if (!standalone && !Application.isEditor)
                        Destroy(this);
#endif
        }

        void Update()
        {
#if ENABLE_INPUT_SYSTEM
            if (Keyboard.current.escapeKey.wasReleasedThisFrame)
#else
            if (Input.GetKeyUp("escape"))
#endif
            {
                Debug.Log($"Quitting App on Escape Key struck.");
                Quit();
            }

#if ENABLE_INPUT_SYSTEM
            if (Keyboard.current.f12Key.wasReleasedThisFrame)
#else
            if (Input.GetKeyUp("f12"))
#endif
            {
                Debug.Log($"Pausing Game on F12 Key struck.");
                Pause();
            }

        }

        void Pause()
        {
#if UNITY_EDITOR
            UnityEditor.EditorApplication.isPaused = true;
#endif
        }

        void Quit()
        {
#if UNITY_EDITOR
            UnityEditor.EditorApplication.isPlaying = false;
#elif UNITY_WEBGL
            Application.ExternalEval("window.close();");
#elif UNITY_STANDALONE
            Application.Quit();
#else
            Application.Quit();
#endif
        }
    }
}