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other-transforms.test.ts
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import dedent from 'dedent'
import { describe } from 'vitest'
import { css, fetchStyles, html, retryAssertion, test, ts, txt } from '../utils'
function createSetup(transformer: 'postcss' | 'lightningcss') {
return {
fs: {
'package.json': txt`
{
"type": "module",
"dependencies": {
"@tailwindcss/vite": "workspace:^",
"tailwindcss": "workspace:^"
},
"devDependencies": {
${transformer === 'lightningcss' ? `"lightningcss": "^1.26.0",` : ''}
"vite": "^6"
}
}
`,
'vite.config.ts': ts`
import tailwindcss from '@tailwindcss/vite'
import { defineConfig } from 'vite'
export default defineConfig({
css: ${transformer === 'postcss' ? '{}' : "{ transformer: 'lightningcss' }"},
build: { cssMinify: false },
plugins: [
tailwindcss(),
{
name: 'recolor',
transform(code, id) {
if (id.includes('.css')) {
return code.replace(/red;/g, 'blue;')
}
},
},
],
})
`,
'index.html': html`
<head>
<link rel="stylesheet" href="./src/index.css" />
</head>
<body>
<div class="foo [background-color:red]">Hello, world!</div>
</body>
`,
'src/index.css': css`
@reference 'tailwindcss/theme';
@import 'tailwindcss/utilities';
.foo {
color: red;
}
`,
},
}
}
describe.each(['postcss', 'lightningcss'] as const)('%s', (transformer) => {
test(`production build`, createSetup(transformer), async ({ fs, exec, expect }) => {
await exec('pnpm vite build')
let files = await fs.glob('dist/**/*.css')
expect(files).toHaveLength(1)
let [filename] = files[0]
await fs.expectFileToContain(filename, [
css`
.foo {
color: blue;
}
`,
// Running the transforms on utilities generated by Tailwind might change in the future
dedent`
.\[background-color\:red\] {
background-color: blue;
}
`,
])
})
test('dev mode', createSetup(transformer), async ({ spawn, fs, expect }) => {
let process = await spawn('pnpm vite dev')
await process.onStdout((m) => m.includes('ready in'))
let url = ''
await process.onStdout((m) => {
let match = /Local:\s*(http.*)\//.exec(m)
if (match) url = match[1]
return Boolean(url)
})
await retryAssertion(async () => {
let styles = await fetchStyles(url, '/index.html')
expect(styles).toContain(css`
.foo {
color: blue;
}
`)
// Running the transforms on utilities generated by Tailwind might change in the future
expect(styles).toContain(dedent`
.\[background-color\:red\] {
background-color: blue;
}
`)
})
await retryAssertion(async () => {
await fs.write(
'src/index.css',
css`
@reference 'tailwindcss/theme';
@import 'tailwindcss/utilities';
.foo {
background-color: red;
}
`,
)
let styles = await fetchStyles(url)
expect(styles).toContain(css`
.foo {
background-color: blue;
}
`)
})
})
test('watch mode', createSetup(transformer), async ({ spawn, fs, expect }) => {
let process = await spawn('pnpm vite build --watch')
await process.onStdout((m) => m.includes('built in'))
await retryAssertion(async () => {
let files = await fs.glob('dist/**/*.css')
expect(files).toHaveLength(1)
let [, styles] = files[0]
expect(styles).toContain(css`
.foo {
color: blue;
}
`)
// Running the transforms on utilities generated by Tailwind might change in the future
expect(styles).toContain(dedent`
.\[background-color\:red\] {
background-color: blue;
}
`)
})
await retryAssertion(async () => {
await fs.write(
'src/index.css',
css`
@reference 'tailwindcss/theme';
@import 'tailwindcss/utilities';
.foo {
background-color: red;
}
`,
)
let files = await fs.glob('dist/**/*.css')
expect(files).toHaveLength(1)
let [, styles] = files[0]
expect(styles).toContain(css`
.foo {
background-color: blue;
}
`)
})
})
})