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next.test.ts
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import { describe } from 'vitest'
import { candidate, css, fetchStyles, js, json, jsx, retryAssertion, test, txt } from '../utils'
test(
'production build',
{
fs: {
'package.json': json`
{
"dependencies": {
"react": "^18",
"react-dom": "^18",
"next": "^14"
},
"devDependencies": {
"@tailwindcss/postcss": "workspace:^",
"tailwindcss": "workspace:^"
}
}
`,
'postcss.config.mjs': js`
export default {
plugins: {
'@tailwindcss/postcss': {},
},
}
`,
'next.config.mjs': js`export default {}`,
'app/layout.js': js`
import './globals.css'
export default function RootLayout({ children }) {
return (
<html>
<body>{children}</body>
</html>
)
}
`,
'app/page.js': js`
import styles from './page.module.css'
export default function Page() {
return (
<h1 className={styles.heading + ' text-3xl font-bold underline'}>Hello, Next.js!</h1>
)
}
`,
'app/page.module.css': css`
@reference './globals.css';
.heading {
@apply text-red-500 animate-ping skew-7;
}
`,
'app/globals.css': css`
@reference 'tailwindcss/theme';
@import 'tailwindcss/utilities';
`,
},
},
async ({ fs, exec, expect }) => {
await exec('pnpm next build')
let files = await fs.glob('.next/static/css/**/*.css')
expect(files).toHaveLength(2)
let globalCss: string | null = null
let moduleCss: string | null = null
for (let [filename, content] of files) {
if (content.includes('@keyframes page_ping')) moduleCss = filename
else globalCss = filename
}
await fs.expectFileToContain(globalCss!, [
candidate`underline`,
candidate`font-bold`,
candidate`text-3xl`,
])
await fs.expectFileToContain(moduleCss!, [
'color:var(--color-red-500,oklch(63.7% .237 25.331)',
'animation:var(--animate-ping,ping 1s cubic-bezier(0,0,.2,1) infinite)',
/@keyframes page_ping.*{75%,to{transform:scale\(2\);opacity:0}/,
'--tw-skew-x:skewX(7deg);',
])
},
)
describe.each(['turbo', 'webpack'])('%s', (bundler) => {
test(
'dev mode',
{
fs: {
'package.json': json`
{
"dependencies": {
"react": "^18",
"react-dom": "^18",
"next": "^14"
},
"devDependencies": {
"@tailwindcss/postcss": "workspace:^",
"tailwindcss": "workspace:^"
}
}
`,
'postcss.config.mjs': js`
export default {
plugins: {
'@tailwindcss/postcss': {},
},
}
`,
'next.config.mjs': js`export default {}`,
'app/layout.js': js`
import './globals.css'
export default function RootLayout({ children }) {
return (
<html>
<body>{children}</body>
</html>
)
}
`,
'app/page.js': js`
import styles from './page.module.css'
export default function Page() {
return <h1 className={styles.heading + ' underline'}>Hello, Next.js!</h1>
}
`,
'app/page.module.css': css`
@reference './globals.css';
.heading {
@apply text-red-500 animate-ping skew-7 content-['module'];
}
`,
'app/globals.css': css`
@reference 'tailwindcss/theme';
@import 'tailwindcss/utilities';
`,
},
},
async ({ fs, spawn, expect }) => {
let process = await spawn(`pnpm next dev ${bundler === 'turbo' ? '--turbo' : ''}`)
let url = ''
await process.onStdout((m) => {
let match = /Local:\s*(http.*)/.exec(m)
if (match) url = match[1]
return Boolean(url)
})
await process.onStdout((m) => m.includes('Ready in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`underline`)
expect(css).toContain('content: var(--tw-content)')
expect(css).toContain('@keyframes')
})
await fs.write(
'app/page.js',
js`
import styles from './page.module.css'
export default function Page() {
return <h1 className={styles.heading + ' underline bg-red-500'}>Hello, Next.js!</h1>
}
`,
)
await process.onStdout((m) => m.includes('Compiled in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`underline`)
expect(css).toContain(candidate`bg-red-500`)
expect(css).toContain('--tw-skew-x: skewX(7deg);')
expect(css).toContain('content: var(--tw-content)')
expect(css).toContain('@keyframes')
})
},
)
})
test(
'should scan dynamic route segments',
{
fs: {
'package.json': json`
{
"dependencies": {
"react": "^18",
"react-dom": "^18",
"next": "^14"
},
"devDependencies": {
"@tailwindcss/postcss": "workspace:^",
"tailwindcss": "workspace:^"
}
}
`,
'postcss.config.mjs': js`
export default {
plugins: {
'@tailwindcss/postcss': {},
},
}
`,
'next.config.mjs': js`export default {}`,
'app/a/[slug]/page.js': js`
export default function Page() {
return <h1 className="content-['[slug]']">Hello, Next.js!</h1>
}
`,
'app/b/[...slug]/page.js': js`
export default function Page() {
return <h1 className="content-['[...slug]']">Hello, Next.js!</h1>
}
`,
'app/c/[[...slug]]/page.js': js`
export default function Page() {
return <h1 className="content-['[[...slug]]']">Hello, Next.js!</h1>
}
`,
'app/d/(theme)/page.js': js`
export default function Page() {
return <h1 className="content-['(theme)']">Hello, Next.js!</h1>
}
`,
'app/layout.js': js`
import './globals.css'
export default function RootLayout({ children }) {
return (
<html>
<body>{children}</body>
</html>
)
}
`,
'app/globals.css': css`
@import 'tailwindcss/utilities' source(none);
@source './**/*.{js,ts,jsx,tsx,mdx}';
`,
},
},
async ({ fs, exec, expect }) => {
await exec('pnpm next build')
let files = await fs.glob('.next/static/css/**/*.css')
expect(files).toHaveLength(1)
let [filename] = files[0]
await fs.expectFileToContain(filename, [
candidate`content-['[slug]']`,
candidate`content-['[...slug]']`,
candidate`content-['[[...slug]]']`,
candidate`content-['(theme)']`,
])
},
)
test(
'changes to CSS files should pick up new CSS variables (if any)',
{
fs: {
'package.json': json`
{
"dependencies": {
"react": "^18",
"react-dom": "^18",
"next": "^14"
},
"devDependencies": {
"@tailwindcss/postcss": "workspace:^",
"tailwindcss": "workspace:^"
}
}
`,
'postcss.config.mjs': js`
export default {
plugins: {
'@tailwindcss/postcss': {},
},
}
`,
'next.config.mjs': js`export default {}`,
'app/layout.js': js`
import './globals.css'
export default function RootLayout({ children }) {
return (
<html>
<body>{children}</body>
</html>
)
}
`,
'app/page.js': js`
export default function Page() {
return <div className="flex"></div>
}
`,
'unrelated.module.css': css`
.module {
color: var(--color-blue-500);
}
`,
'app/globals.css': css`
@import 'tailwindcss/theme';
@import 'tailwindcss/utilities';
`,
},
},
async ({ spawn, exec, fs, expect }) => {
// Generate the initial build so output CSS files exist on disk
await exec('pnpm next build')
// NOTE: We are writing to an output CSS file which is not being ignored by
// `.gitignore` nor marked with `@source not`. This should not result in an
// infinite loop.
let process = await spawn(`pnpm next dev`)
let url = ''
await process.onStdout((m) => {
let match = /Local:\s*(http.*)/.exec(m)
if (match) url = match[1]
return Boolean(url)
})
await process.onStdout((m) => m.includes('Ready in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`flex`)
expect(css).toContain('--color-blue-500:')
expect(css).not.toContain('--color-red-500:')
})
await fs.write(
'unrelated.module.css',
css`
.module {
color: var(--color-blue-500);
background-color: var(--color-red-500);
}
`,
)
await process.onStdout((m) => m.includes('Compiled in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`flex`)
expect(css).toContain('--color-blue-500:')
expect(css).toContain('--color-red-500:')
})
},
)
test(
'changes to `public/` should not trigger an infinite loop',
{
fs: {
'package.json': json`
{
"dependencies": {
"react": "^18",
"react-dom": "^18",
"next": "^15",
"@ducanh2912/next-pwa": "^10.2.9"
},
"devDependencies": {
"@tailwindcss/postcss": "workspace:^",
"tailwindcss": "workspace:^"
}
}
`,
'.gitignore': txt`
.next/
public/workbox-*.js
public/sw.js
`,
'postcss.config.mjs': js`
export default {
plugins: {
'@tailwindcss/postcss': {},
},
}
`,
'next.config.mjs': js`
import withPWA from '@ducanh2912/next-pwa'
const pwaConfig = {
dest: 'public',
register: true,
skipWaiting: true,
reloadOnOnline: false,
cleanupOutdatedCaches: true,
clientsClaim: true,
maximumFileSizeToCacheInBytes: 20 * 1024 * 1024,
}
const nextConfig = {}
const configWithPWA = withPWA(pwaConfig)(nextConfig)
export default configWithPWA
`,
'app/layout.js': js`
import './globals.css'
export default function RootLayout({ children }) {
return (
<html>
<body>{children}</body>
</html>
)
}
`,
'app/page.js': js`
export default function Page() {
return <div className="flex"></div>
}
`,
'app/globals.css': css`
@import 'tailwindcss/theme';
@import 'tailwindcss/utilities';
`,
},
},
async ({ spawn, fs, expect }) => {
let process = await spawn('pnpm next dev')
let url = ''
await process.onStdout((m) => {
let match = /Local:\s*(http.*)/.exec(m)
if (match) url = match[1]
return Boolean(url)
})
await process.onStdout((m) => m.includes('Ready in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`flex`)
expect(css).not.toContain(candidate`underline`)
})
await fs.write(
'app/page.js',
jsx`
export default function Page() {
return <div className="flex underline"></div>
}
`,
)
await process.onStdout((m) => m.includes('Compiled in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`flex`)
expect(css).toContain(candidate`underline`)
})
// Flush all existing messages in the queue
process.flush()
// Fetch the styles one more time, to ensure we see the latest version of
// the CSS
await fetchStyles(url)
// At this point, no changes should triger a compile step. If we see any
// changes, there is an infinite loop because we (the user) didn't write any
// files to disk.
//
// Ensure there are no more changes in stdout (signaling no infinite loop)
let result = await Promise.race([
// If this succeeds, it means that it saw another change which indicates
// an infinite loop.
process.onStdout((m) => m.includes('Compiled in')).then(() => 'infinite loop detected'),
// There should be no changes in stdout
new Promise((resolve) => setTimeout(() => resolve('no infinite loop detected'), 2_000)),
])
expect(result).toBe('no infinite loop detected')
},
)