All files / src router.js

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export class Router {
  #global;
  /** @type {Set<RouteCallback>} */
  #routerSubscriptions = new Set();
 
  /** @param {Pick<globalThis, 'addEventListener'> & { location: { hash: string }}} win */
  constructor(win = window) {
    this.#global = win;
    this.#global.addEventListener('hashchange', () => {
      this.#routerSubscriptions.forEach((sub) => sub(this.#currentRoute));
    });
  }
 
  /** @param {string[]} route */
  navigate(route) {
    this.#currentRoute = route;
  }
  /** @param {RouteCallback} callback */
  onNext(callback) {
    this.#routerSubscriptions.add(callback);
    callback(this.#currentRoute);
    return () => {
      this.#routerSubscriptions.delete(callback);
    };
  }
 
  get #currentRoute() {
    return this.#global.location.hash.substring(1).split('/');
  }
  set #currentRoute(route) {
    this.#global.location.hash = `#${route.join('/')}`;
  }
}
 
export const router = new Router();