connectHistory() 
ts
function connectHistory(router: Routes): void;Connects a router instance to the history API. This allows us to reliably check for active routes, or to listen to path changes.
It is usually called once the routes are registered.
Parameters 
router 
Routes
Returns 
void
Example 
ts
class RootComponent extends LitElement {
  readonly #router = new Router(this, [ ... ]);
  constructor() {
    super();
    // bind history to router
    connectHistory(this.#router);
  }
  override render() {
    return html`
      <main>${this.#router.outlet()}</main>
    `;
  }
  // ...
}