Update Router.route type def

[trusktr]

A Router's .route property is initially undefined, and not available until after the first microtask after instantiation.

const router = new Router()

console.log(router.route) // undefined

queueMicrotask(() => {
  console.log(router.route) // Route
})

.route is set upon first navigate() call, here:

app-tools/router/index.js

Line 209 in 8c514c4

this.route = route;

First navigate() happens here:

app-tools/router/index.js

Lines 53 to 55 in 8c514c4

	queueMicrotask(() => {
	this.navigate(new URL(window.location.href), { replace: true });
	});