Method createEffect

www/js/_hyperscript.esm.js:3496–3512

* Create a reactive effect with automatic dependency tracking. * @param {() => any} expression - The watched expression * @param {(value: any) => void} handler - Called when the value changes * @param {Object} [options] * @param {Element} [options.element] - Auto-stop when element discon

(expression, handler, options)

   * @returns {() => void} Stop function
   */
  createEffect(expression, handler, options) {
    var effect = new Effect(
      expression,
      handler,
      options && options.element || null,
      this
    );
    effect.initialize();
    if (effect.element) {
      var data = effect.element._hyperscript ??= {};
      data.effects ??= /* @__PURE__ */ new Set();
      data.effects.add(effect);
    }
    return function() {
      effect.stop();
    };
  }
  /** Stop all reactive effects owned by an element. */
  stopElementEffects(element) {
    var data = element._hyperscript;