web: Add vue router.

web/src/App.vue

@@ -1,20 +1,11 @@
 <template>
-  <img alt="Vue logo" src="./assets/logo.png" />
-  <HelloWorld msg="Welcome to Your Vue.js + TypeScript App" />
+  <div id="nav">
+    <router-link to="/">Home</router-link> |
+    <router-link to="/about">About</router-link>
+  </div>
+  <router-view />
 </template>
 
-<script lang="ts">
-import { defineComponent } from "vue";
-import HelloWorld from "./components/HelloWorld.vue";
-
-export default defineComponent({
-  name: "App",
-  components: {
-    HelloWorld,
-  },
-});
-</script>
-
 <style lang="scss">
 #app {
   font-family: Avenir, Helvetica, Arial, sans-serif;
@@ -22,6 +13,18 @@ export default defineComponent({
   -moz-osx-font-smoothing: grayscale;
   text-align: center;
   color: #2c3e50;
-  margin-top: 60px;
+}
+
+#nav {
+  padding: 30px;
+
+  a {
+    font-weight: bold;
+    color: #2c3e50;
+
+    &.router-link-exact-active {
+      color: #42b983;
+    }
+  }
 }
 </style>

web/src/components/HelloWorld.vue

@@ -87,10 +87,10 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from "vue";
+import { defineComponent } from 'vue';
 
 export default defineComponent({
-  name: "HelloWorld",
+  name: 'HelloWorld',
   props: {
     msg: String,
   },

web/src/main.ts

@@ -1,4 +1,5 @@
-import { createApp } from "vue";
-import App from "./App.vue";
+import { createApp } from 'vue';
+import App from './App.vue';
+import router from './router';
 
-createApp(App).mount("#app");
+createApp(App).use(router).mount('#app');

web/src/router/index.ts

@@ -0,0 +1,26 @@
+import { createRouter, createWebHistory, RouteRecordRaw } from 'vue-router';
+import Home from '../views/Home.vue';
+
+const routes: Array<RouteRecordRaw> = [
+  {
+    path: '/',
+    name: 'Home',
+    component: Home,
+  },
+  {
+    path: '/about',
+    name: 'About',
+    // route level code-splitting
+    // this generates a separate chunk (about.[hash].js) for this route
+    // which is lazy-loaded when the route is visited.
+    component: () =>
+      import(/* webpackChunkName: "about" */ '../views/About.vue'),
+  },
+];
+
+const router = createRouter({
+  history: createWebHistory(process.env.BASE_URL),
+  routes,
+});
+
+export default router;

web/src/views/About.vue

@@ -0,0 +1,5 @@
+<template>
+  <div class="about">
+    <h1>This is an about page</h1>
+  </div>
+</template>

web/src/views/Home.vue

@@ -0,0 +1,18 @@
+<template>
+  <div class="home">
+    <img alt="Vue logo" src="../assets/logo.png" />
+    <HelloWorld msg="Welcome to Your Vue.js App" />
+  </div>
+</template>
+
+<script>
+// @ is an alias to /src
+import HelloWorld from '@/components/HelloWorld.vue';
+
+export default {
+  name: 'Home',
+  components: {
+    HelloWorld,
+  },
+};
+</script>