Symbol-basierte WeakMap-Isolierung für benutzerdefinierte Direktiven-Instanzen

const INSTANCE_KEY = Symbol('directive_state');
const stateStore = new WeakMap();
 
export const vSecureClick = {
  mounted(el, binding) {
    const handler = (event) => {
      if (!el.contains(event.target)) return;
      binding.value(event);
    };
    stateStore.set(el, { [INSTANCE_KEY]: handler });
    document.addEventListener('click', handler, true);
  },
  unmounted(el) {
    const state = stateStore.get(el);
    if (state && state[INSTANCE_KEY]) {
      document.removeEventListener('click', state[INSTANCE_KEY], true);
      stateStore.delete(el);
    }
  }
};