Objektorientierte Subklassifizierung von EventTarget für entkoppelte Svelte-Zustandsbenachrichtigungen

export class SvelteStateBridge extends EventTarget {
  #state;
 
  constructor(initialState) {
    super();
    this.#state = initialState;
  }
 
  get state() {
    return this.#state;
  }
 
  update(patch) {
    const previous = { ...this.#state };
    this.#state = Object.assign({}, this.#state, patch);
    this.dispatchEvent(new CustomEvent('statechange', { detail: { current: this.#state, previous } }));
  }
}