Nuxt/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'
import { isRenderingJson } from './utils'
// We only want to run this test for:
// - ubuntu
// - vite
// - in our own CI
// - using JS (default) payload rendering
// - production build
describe.skipIf(isWindows || process.env.TEST_BUILDER === 'webpack' || process.env.ECOSYSTEM_CI || !isRenderingJson || process.env.TEST_ENV === 'dev')('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(roundToKilobytes(stats.client.totalBytes)).toMatchInlineSnapshot('"94.1k"')
expect(stats.client.files.map(f => f.replace(/\..*\.js/, '.js'))).toMatchInlineSnapshot(`
[
"_nuxt/entry.js",
"_nuxt/error-component.js",
]
`)
})
it('default server bundle size', async () => {
stats.server = await analyzeSizes(['**/*.mjs', '!node_modules'], serverDir)
expect(roundToKilobytes(stats.server.totalBytes)).toMatchInlineSnapshot('"66.7k"')
const modules = await analyzeSizes('node_modules/**/*', serverDir)
expect(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot('"2654k"')
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",
"@unhead/dom",
"@unhead/shared",
"@unhead/ssr",
"@vue/compiler-core",
"@vue/compiler-dom",
"@vue/compiler-ssr",
"@vue/reactivity",
"@vue/runtime-core",
"@vue/runtime-dom",
"@vue/server-renderer",
"@vue/shared",
"cookie-es",
"defu",
"destr",
"devalue",
"estree-walker",
"h3",
"hookable",
"iron-webcrypto",
"node-fetch-native",
"ofetch",
"ohash",
"pathe",
"radix3",
"scule",
"source-map",
"ufo",
"uncrypto",
"unctx",
"unenv",
"unhead",
"unstorage",
"vue",
"vue-bundle-renderer",
]
`)
})
})
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 path = join(rootDir, file)
const isSymlink = (await fsp.lstat(path).catch(() => null))?.isSymbolicLink()
if (!isSymlink) {
const bytes = Buffer.byteLength(await fsp.readFile(path))
totalBytes += bytes
}
}
return { files, totalBytes }
}
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function roundToKilobytes (bytes: number) {
return (bytes / 1024).toFixed(bytes > (100 * 1024) ? 0 : 1) + 'k'
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}