fix: only optimize configured locale files (#3433)

Author: BobbieGoede

specs/fixtures/issues/3404/app.vue

@@ -0,0 +1,6 @@
+<template>
+  <div>
+    <NuxtRouteAnnouncer />
+    <NuxtPage />
+  </div>
+</template>

specs/fixtures/issues/3404/i18n/i18n.config.ts

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+import en from './locales/en'
+import nl from './locales/nl'
+
+export default defineI18nConfig(() => ({
+  messages: {
+    en,
+    nl
+  }
+}))

specs/fixtures/issues/3404/i18n/locales/en/greeting.js

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+export default {
+  hello: 'Hello!'
+}

specs/fixtures/issues/3404/i18n/locales/en/index.js

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+import greeting from './greeting'
+
+export default {
+  greeting
+}

specs/fixtures/issues/3404/i18n/locales/nl/greeting.js

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+export default {
+  hello: 'Hallo!'
+}

specs/fixtures/issues/3404/i18n/locales/nl/index.js

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+import greeting from './greeting'
+
+export default {
+  greeting
+}

specs/fixtures/issues/3404/nuxt.config.ts

@@ -0,0 +1,7 @@
+// https://nuxt.com/docs/api/configuration/nuxt-config
+export default defineNuxtConfig({
+  modules: ['@nuxtjs/i18n'],
+  i18n: {
+    locales: ['en', 'nl']
+  }
+})

specs/fixtures/issues/3404/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "fixture-3404",
+  "private": true,
+  "scripts": {
+    "build": "nuxt build",
+    "dev": "nuxt dev",
+    "generate": "nuxt generate",
+    "preview": "nuxt preview"
+  },
+  "devDependencies": {
+    "@nuxtjs/i18n": "latest",
+    "nuxt": "latest"
+  }
+}

specs/fixtures/issues/3404/pages/index.vue

@@ -0,0 +1,5 @@
+<template>
+  <div>
+    <h1 id="translated-heading">{{ $t('greeting.hello') }}</h1>
+  </div>
+</template>

specs/issues/3404.spec.ts

@@ -0,0 +1,21 @@
+import { test, expect, describe } from 'vitest'
+import { fileURLToPath } from 'node:url'
+import { createPage, setup, url } from '../utils'
+import { getText } from '../helper'
+
+describe('#3404', async () => {
+  await setup({
+    rootDir: fileURLToPath(new URL(`../fixtures/issues/3404`, import.meta.url)),
+    browser: true
+  })
+
+  test('resource optimization excludes files not configured in `i18n.locales.*.files`', async () => {
+    const page = await createPage('/en')
+    const heading = await getText(page, '#translated-heading')
+    expect(heading).toEqual(`Hello!`)
+
+    await page.goto(url('/nl'))
+    const heading2 = await getText(page, '#translated-heading')
+    expect(heading2).toEqual(`Hallo!`)
+  })
+})