test: add bundle size test

test/bundle.test.ts

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+import { fileURLToPath } from 'node:url'
+import fsp from 'node:fs/promises'
+import { afterAll, beforeAll, describe, expect, it } from 'vitest'
+import { execaCommand } from 'execa'
+import { globby } from 'globby'
+import { join } from 'pathe'
+import { isWindows } from 'std-env'
+
+describe.skipIf(isWindows)('minimal nuxt application', () => {
+  const rootDir = fileURLToPath(new URL('./fixtures/minimal', import.meta.url))
+  const publicDir = join(rootDir, '.output/public')
+  const serverDir = join(rootDir, '.output/server')
+
+  const stats = {
+    client: { totalBytes: 0, files: [] as string[] },
+    server: { totalBytes: 0, files: [] as string[] }
+  }
+
+  beforeAll(async () => {
+    await execaCommand(`pnpm nuxi build ${rootDir}`)
+  }, 120 * 1000)
+
+  afterAll(async () => {
+    await fsp.writeFile(join(rootDir, '.output/test-stats.json'), JSON.stringify(stats, null, 2))
+  })
+
+  it('default client bundle size', async () => {
+    stats.client = await analyzeSizes('**/*.js', publicDir)
+    expect(stats.client.totalBytes).toBeLessThan(110000)
+    expect(stats.client.files.map(f => f.replace(/\..*\.js/, '.js'))).toMatchInlineSnapshot(`
+      [
+        "_nuxt/entry.js",
+        "_nuxt/error-404.js",
+        "_nuxt/error-500.js",
+        "_nuxt/error-component.js",
+      ]
+    `)
+  })
+
+  it('default server bundle size', async () => {
+    stats.server = await analyzeSizes(['**/*.mjs', '!node_modules'], serverDir)
+    expect(stats.server.totalBytes).toBeLessThan(120000)
+
+    const modules = await analyzeSizes('node_modules/**/*', serverDir)
+    expect(modules.totalBytes).toBeLessThan(2700000)
+
+    const packages = modules.files
+      .filter(m => m.endsWith('package.json'))
+      .map(m => m.replace('/package.json', '').replace('node_modules/', ''))
+      .sort()
+    expect(packages).toMatchInlineSnapshot(`
+      [
+        "@babel/parser",
+        "@vue/compiler-core",
+        "@vue/compiler-dom",
+        "@vue/compiler-ssr",
+        "@vue/reactivity",
+        "@vue/runtime-core",
+        "@vue/runtime-dom",
+        "@vue/server-renderer",
+        "@vue/shared",
+        "@vueuse/shared",
+        "buffer-from",
+        "cookie-es",
+        "defu",
+        "destr",
+        "estree-walker",
+        "h3",
+        "hookable",
+        "node-fetch-native",
+        "ohash",
+        "ohmyfetch",
+        "pathe",
+        "radix3",
+        "scule",
+        "source-map",
+        "source-map-support",
+        "ufo",
+        "unctx",
+        "unenv",
+        "unstorage",
+        "vue",
+        "vue-bundle-renderer",
+        "vue-demi",
+      ]
+    `)
+  })
+})
+
+async function analyzeSizes (pattern: string | string[], rootDir: string) {
+  const files: string[] = await globby(pattern, { cwd: rootDir })
+  let totalBytes = 0
+  for (const file of files) {
+    const bytes = Buffer.byteLength(await fsp.readFile(join(rootDir, file)))
+    totalBytes += bytes
+  }
+  return { files, totalBytes }
+}

test/fixtures/minimal/app.vue

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+<template>
+  <div>Hello World!</div>
+</template>

test/fixtures/minimal/nuxt.config.ts

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+export default defineNuxtConfig({})

test/fixtures/minimal/tsconfig.json

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+{
+  "extends": "./.nuxt/tsconfig.json"
+}