Nuxt/test/bundle.test.ts

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import { fileURLToPath } from 'node:url'
import fsp from 'node:fs/promises'
import { beforeAll, describe, expect, it } from 'vitest'
import { exec } from 'tinyexec'
import { glob } from 'tinyglobby'
import { join } from 'pathe'
describe.skipIf(process.env.SKIP_BUNDLE_SIZE === 'true' || process.env.ECOSYSTEM_CI)('minimal nuxt application', () => {
const rootDir = fileURLToPath(new URL('./fixtures/minimal', import.meta.url))
beforeAll(async () => {
await Promise.all([
exec('pnpm', ['nuxi', 'build', rootDir], { nodeOptions: { env: { EXTERNAL_VUE: 'false' } } }),
exec('pnpm', ['nuxi', 'build', rootDir], { nodeOptions: { env: { EXTERNAL_VUE: 'true' } } }),
])
}, 120 * 1000)
// Identical behaviour between inline/external vue options as this should only affect the server build
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it('default client bundle size', async () => {
const [clientStats, clientStatsInlined] = await Promise.all((['.output', '.output-inline'])
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.map(outputDir => analyzeSizes(['**/*.js'], join(rootDir, outputDir, 'public'))))
expect.soft(roundToKilobytes(clientStats!.totalBytes)).toMatchInlineSnapshot(`"114k"`)
expect.soft(roundToKilobytes(clientStatsInlined!.totalBytes)).toMatchInlineSnapshot(`"114k"`)
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const files = new Set([...clientStats!.files, ...clientStatsInlined!.files].map(f => f.replace(/\..*\.js/, '.js')))
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expect([...files]).toMatchInlineSnapshot(`
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[
"_nuxt/entry.js",
]
`)
})
it('default server bundle size', async () => {
const serverDir = join(rootDir, '.output/server')
const serverStats = await analyzeSizes(['**/*.mjs', '!node_modules'], serverDir)
expect.soft(roundToKilobytes(serverStats.totalBytes)).toMatchInlineSnapshot(`"208k"`)
const modules = await analyzeSizes(['node_modules/**/*'], serverDir)
expect.soft(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot(`"1388k"`)
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",
"db0",
"devalue",
"entities",
"estree-walker",
"hookable",
"source-map-js",
"ufo",
"unhead",
"vue",
"vue-bundle-renderer",
]
`)
})
it('default server bundle size (inlined vue modules)', async () => {
const serverDir = join(rootDir, '.output-inline/server')
const serverStats = await analyzeSizes(['**/*.mjs', '!node_modules'], serverDir)
expect.soft(roundToKilobytes(serverStats.totalBytes)).toMatchInlineSnapshot(`"557k"`)
const modules = await analyzeSizes(['node_modules/**/*'], serverDir)
expect.soft(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot(`"88.2k"`)
const packages = modules.files
.filter(m => m.endsWith('package.json'))
.map(m => m.replace('/package.json', '').replace('node_modules/', ''))
.sort()
expect(packages).toMatchInlineSnapshot(`
[
"@unhead/dom",
"@unhead/shared",
"@unhead/ssr",
"db0",
"devalue",
"hookable",
"unhead",
]
`)
})
})
async function analyzeSizes (pattern: string[], rootDir: string) {
const files: string[] = await glob(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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}