Capri

Vue

Create a new site

npm init capri my-capri-site -- -e vue

This will download and install capri-js/capri/examples/vue.

You can view a deployed version of the demo on GitHub pages, including the preview SPA.

Entry files

The client entry file is a regular vue single page app:

// src/main.tsx

import { createApp } from "vue";

import App from "./App.vue";
import createRouter from "./router.js";

const app = createApp(App);
app.use(createRouter());

app.mount("#app");
// src/main.server.tsx

import { createSSRApp } from "vue";
import { renderToString } from "vue/server-renderer";

import App from "./App.vue";
import createRouter from "./router.js";

export async function render(url: string) {
  const app = createSSRApp(App);
  const router = createRouter();
  app.use(router);
  router.push(`http://127.0.0.1${url}`);
  await router.isReady();
  const html = await renderToString(app);
  return {
    "#app": html,
  };
}

Islands

you can define interactive islands by naming your components *.island.vue:

// src/Counter.island.vue

<script lang="ts">
  import { defineComponent } from "vue";

  export default defineComponent({
    props: {
      start: Number,
    },
    data() {
      return {
        count: this.start ?? 0,
      };
    },
  });
</script>

<template>
  <div>
    <button @click="count--">-</button>
    <span>{{ count }}</span>
    <button @click="count++">+</button>
  </div>
</template>

<style scoped>
  div {
    display: inline-flex;
    gap: 0.5em;
  }
</style>

Media queries

You can export an options object in the module context to hydrate an island as soon as a media query matches. The following example will hydrate once the viewport width gets below 700px:

<script lang="ts">
  export const options = {
    media: "(max-width:500px)",
  };
</script>

<script setup lang="ts">
  import { ref, onMounted } from "vue";

  const content = ref(
    "Resize your browser below 500px to hydrate this island."
  );

  onMounted(() => {
    content.value = "The island has been hydrated.";
  });
</script>

<template>
  <div class="box">{{ content }}</div>
</template>

Data fetching

Vue components can load data by awaiting a promise in their setup script:

// src/Profile.tsx

<script setup lang="ts">
async function fetchUser() {
  const res = await fetch("https://api.example.com/user");
  return res.json();
}
const user = await fetchUser();
</script>
<template>
  <span>{{ user.name }}</span>
</template>

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