i18n for Vue 3 with Composition API

main.ts

import { createApp } from "vue";
import { createI18n } from "vue-i18n";
import App from "./App.vue";

import messages from "@intlify/unplugin-vue-i18n/messages";

const i18n = createI18n({
  legacy: false,
  globalInjection: true,
  locale: "es",
  fallbackLocale: "es",
  availableLocales: ["es", "en"],
  messages: messages,
});

const app = createApp(App)

app.use(i18n)
app.mount('#app')