Edit

No Match (404)

When the URL of the page does not match a route in the application you'll likely want to display a not found page.

import { createRouter, defineRoute } from "type-route";

const { session } = createRouter({
  home: defineRoute("/"),
  foo: defineRoute("/foo"),
  bar: defineRoute("/bar")
});

const route = session.getInitialRoute();
console.log(route.name);
// This will log either "home", "foo", "bar", or (if the url
// doesn't match one of these routes) the boolean false.

When the name of the route is the boolean false you can know the URL doesn't match one of the defined routes in your application. You may check against this to determine which page is rendered by the application. Here's a full example:

import React, { useState, useEffect } from "react";
import ReactDOM from "react-dom";
import { createRouter, defineRoute } from "type-route";

const { routes, useRoute, RouteProvider } = createRouter({
  home: defineRoute("/"),
  foo: defineRoute("/foo"),
  bar: defineRoute("/bar")
});

function App() {
  const route = useRoute();

  return (
    <>
      <nav>
        <a {...routes.home().link}>Home</a>
        <a {...routes.foo().link}>Foo</a>
        <a {...routes.bar().link}>Bar</a>
        <a href="/path-that-does-not-match-a-defined-route">Not Found</a>
      </nav>
      {route.name === "home" && <div>Home</div>}
      {route.name === "foo" && <div>Foo</div>}
      {route.name === "bar" && <div>Bar</div>}
      {route.name === false && <div>Not Found</div>}
    </>
  );
}

ReactDOM.render(<RouteProvider><App /></RouteProvider>, document.querySelector("#root"));