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import fs from 'fs'
import path from 'path'
import postcss from 'postcss'
import tailwind from '../src/index'
import { tailwindExtractor } from '../src/lib/purgeUnusedStyles'
import defaultConfig from '../stubs/defaultConfig.stub.js'
function suppressConsoleLogs(cb, type = 'warn') {
return () => {
const spy = jest.spyOn(global.console, type).mockImplementation(jest.fn())
const promise = new Promise((resolve, reject) => {
Promise.resolve(cb()).then(resolve, reject)
})
promise.then(spy.mockRestore, spy.mockRestore)
return promise
}
}
function extractRules(root) {
let rules = []
root.walkRules((r) => {
rules = rules.concat(r.selectors)
})
return rules
}
async function inProduction(callback) {
const OLD_NODE_ENV = process.env.NODE_ENV
process.env.NODE_ENV = 'production'
const result = await callback()
process.env.NODE_ENV = OLD_NODE_ENV
return result
}
const config = {
...defaultConfig,
theme: {
extend: {
colors: {
'black!': '#000',
},
spacing: {
1.5: '0.375rem',
'(1/2+8)': 'calc(50% + 2rem)',
},
minHeight: {
'(screen-4)': 'calc(100vh - 1rem)',
},
fontFamily: {
'%#$@': 'Comic Sans',
},
},
},
}
delete config.presets
function assertPurged(result) {
expect(result.css).not.toContain('.bg-red-600')
expect(result.css).not.toContain('.w-1\\/3')
expect(result.css).not.toContain('.flex')
expect(result.css).not.toContain('.font-sans')
expect(result.css).not.toContain('.text-right')
expect(result.css).not.toContain('.px-4')
expect(result.css).not.toContain('.h-full')
expect(result.css).toContain('.bg-red-500')
expect(result.css).toContain('.md\\:bg-blue-300')
expect(result.css).toContain('.w-1\\/2')
expect(result.css).toContain('.block')
expect(result.css).toContain('.md\\:flow-root')
expect(result.css).toContain('.h-screen')
expect(result.css).toContain('.min-h-\\(screen-4\\)')
expect(result.css).toContain('.bg-black\\!')
expect(result.css).toContain('.font-\\%\\#\\$\\@')
expect(result.css).toContain('.w-\\(1\\/2\\+8\\)')
expect(result.css).toContain('.inline-grid')
expect(result.css).toContain('.grid-cols-3')
expect(result.css).toContain('.px-1\\.5')
expect(result.css).toContain('.col-span-2')
expect(result.css).toContain('.col-span-1')
expect(result.css).toContain('.text-center')
expect(result.css).toContain('.flow-root')
expect(result.css).toContain('.text-green-700')
expect(result.css).toContain('.bg-green-100')
expect(result.css).toContain('.text-left')
expect(result.css).toContain('.font-mono')
expect(result.css).toContain('.col-span-4')
expect(result.css).toContain('.tracking-tight')
expect(result.css).toContain('.whitespace-nowrap')
}
test('purges unused classes', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
purge: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
}),
])
.process(input, { from: inputPath })
.then((result) => {
assertPurged(result)
})
})
)
})
test('custom css is not purged by default', () => {
return inProduction(
suppressConsoleLogs(() => {
return postcss([
tailwind({
...config,
purge: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
}),
])
.process(
`
@tailwind base;
@tailwind components;
@tailwind utilities;
.example {
@apply font-bold;
color: theme('colors.red.500');
}
`,
{ from: null }
)
.then((result) => {
const rules = extractRules(result.root)
assertPurged(result)
expect(rules).toContain('.example')
})
})
)
})
test('custom css that uses @responsive is not purged by default', () => {
return inProduction(
suppressConsoleLogs(() => {
return postcss([
tailwind({
...config,
purge: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
}),
])
.process(
`
@tailwind base;
@tailwind components;
@tailwind utilities;
@responsive {
.example {
@apply font-bold;
color: theme('colors.red.500');
}
}
`,
{ from: null }
)
.then((result) => {
const rules = extractRules(result.root)
assertPurged(result)
expect(rules).toContain('.example')
})
})
)
})
test('custom css in a layer is purged by default when using layers mode', () => {
return inProduction(
suppressConsoleLogs(() => {
return postcss([
tailwind({
...config,
future: {
purgeLayersByDefault: true,
},
purge: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
}),
])
.process(
`
@tailwind base;
@tailwind components;
@layer components {
.example {
@apply font-bold;
color: theme('colors.red.500');
}
}
@tailwind utilities;
`,
{ from: null }
)
.then((result) => {
const rules = extractRules(result.root)
assertPurged(result)
expect(rules).not.toContain('.example')
})
})
)
})
test('custom css in a layer in a @responsive at-rule is purged by default', () => {
return inProduction(
suppressConsoleLogs(() => {
return postcss([
tailwind({
...config,
future: {
purgeLayersByDefault: true,
},
purge: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
}),
])
.process(
`
@tailwind base;
@tailwind components;
@layer components {
@responsive {
.example {
@apply font-bold;
color: theme('colors.red.500');
}
}
}
@tailwind utilities;
`,
{ from: null }
)
.then((result) => {
const rules = extractRules(result.root)
assertPurged(result)
expect(rules).not.toContain('.example')
})
})
)
})
test('purges unused classes with important string', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
important: '#tailwind',
purge: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
}),
])
.process(input, { from: inputPath })
.then((result) => {
assertPurged(result)
})
})
)
})
test('mode must be a valid value', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return expect(
postcss([
tailwind({
...config,
purge: {
mode: 'poop',
content: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
},
}),
]).process(input, { from: inputPath })
).rejects.toThrow()
})
)
})
test('components are purged by default in layers mode', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
future: {
purgeLayersByDefault: true,
},
purge: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
}),
])
.process(input, { from: inputPath })
.then((result) => {
expect(result.css).not.toContain('.container')
assertPurged(result)
})
})
)
})
test('you can specify which layers to purge', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
future: {
purgeLayersByDefault: true,
},
purge: {
mode: 'layers',
layers: ['utilities'],
content: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
},
}),
])
.process(input, { from: inputPath })
.then((result) => {
const rules = extractRules(result.root)
expect(rules).toContain('optgroup')
expect(rules).toContain('.container')
assertPurged(result)
})
})
)
})
test('you can purge just base and component layers (but why)', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
future: {
purgeLayersByDefault: true,
},
purge: {
mode: 'layers',
layers: ['base', 'components'],
content: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
},
}),
])
.process(input, { from: inputPath })
.then((result) => {
const rules = extractRules(result.root)
expect(rules).not.toContain('[type="checkbox"]')
expect(rules).not.toContain('.container')
expect(rules).toContain('.float-left')
expect(rules).toContain('.md\\:bg-red-500')
expect(rules).toContain('.lg\\:appearance-none')
})
})
)
})
test('extra purgecss control comments can be added manually', () => {
return inProduction(
suppressConsoleLogs(() => {
const input = `
@tailwind base;
/* purgecss start ignore */
.btn {
background: red;
}
/* purgecss end ignore */
@tailwind components;
@tailwind utilities;
`
return postcss([
tailwind({
...config,
purge: {
layers: ['utilities'],
content: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
},
}),
])
.process(input, { from: null })
.then((result) => {
const rules = extractRules(result.root)
expect(rules).toContain('.btn')
expect(rules).toContain('.container')
assertPurged(result)
})
})
)
})
test(
'does not purge except in production',
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...defaultConfig,
purge: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
}),
])
.process(input, { from: inputPath })
.then((result) => {
const expected = fs.readFileSync(
path.resolve(`${__dirname}/fixtures/tailwind-output.css`),
'utf8'
)
expect(result.css).toMatchCss(expected)
})
})
)
test('does not purge if the array is empty', () => {
return inProduction(
suppressConsoleLogs(() => {
const OLD_NODE_ENV = process.env.NODE_ENV
process.env.NODE_ENV = 'production'
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...defaultConfig,
purge: [],
}),
])
.process(input, { from: inputPath })
.then((result) => {
process.env.NODE_ENV = OLD_NODE_ENV
const expected = fs.readFileSync(
path.resolve(`${__dirname}/fixtures/tailwind-output.css`),
'utf8'
)
expect(result.css).toMatchCss(expected)
})
})
)
})
test('does not purge if explicitly disabled', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...defaultConfig,
purge: { enabled: false },
}),
])
.process(input, { from: inputPath })
.then((result) => {
const expected = fs.readFileSync(
path.resolve(`${__dirname}/fixtures/tailwind-output.css`),
'utf8'
)
expect(result.css).toMatchCss(expected)
})
})
)
})
test('does not purge if purge is simply false', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...defaultConfig,
purge: false,
}),
])
.process(input, { from: inputPath })
.then((result) => {
const expected = fs.readFileSync(
path.resolve(`${__dirname}/fixtures/tailwind-output.css`),
'utf8'
)
expect(result.css).toMatchCss(expected)
})
})
)
})
test('purges outside of production if explicitly enabled', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
purge: { enabled: true, content: [path.resolve(`${__dirname}/fixtures/**/*.html`)] },
}),
])
.process(input, { from: inputPath })
.then((result) => {
assertPurged(result)
})
})
)
})
test(
'purgecss options can be provided',
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
purge: {
enabled: true,
options: {
content: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
safelist: ['md:bg-green-500'],
},
},
}),
])
.process(input, { from: inputPath })
.then((result) => {
expect(result.css).toContain('.md\\:bg-green-500')
assertPurged(result)
})
})
)
test(
'can purge all CSS, not just Tailwind classes',
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
purge: {
enabled: true,
mode: 'all',
content: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
},
}),
function (css) {
// Remove any comments to avoid accidentally asserting against them
// instead of against real CSS rules.
css.walkComments((c) => c.remove())
},
])
.process(input, { from: inputPath })
.then((result) => {
expect(result.css).toContain('html')
expect(result.css).toContain('body')
expect(result.css).toContain('samp')
expect(result.css).not.toContain('.example')
expect(result.css).not.toContain('.sm\\:example')
assertPurged(result)
})
})
)
test('element selectors are preserved by default', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
purge: {
content: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
mode: 'all',
},
}),
])
.process(input, { from: inputPath })
.then((result) => {
const rules = extractRules(result.root)
;[
'a',
'blockquote',
'body',
'code',
'fieldset',
'figure',
'h1',
'h2',
'h3',
'h4',
'h5',
'h6',
'hr',
'html',
'img',
'kbd',
'ol',
'p',
'pre',
'strong',
'sup',
'table',
'ul',
].forEach((e) => expect(rules).toContain(e))
assertPurged(result)
})
})
)
})
test('element selectors are preserved even when defaultExtractor is overridden', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
purge: {
content: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
mode: 'all',
preserveHtmlElements: true,
options: {
defaultExtractor: tailwindExtractor,
},
},
}),
])
.process(input, { from: inputPath })
.then((result) => {
const rules = extractRules(result.root)
;[
'a',
'blockquote',
'body',
'code',
'fieldset',
'figure',
'h1',
'h2',
'h3',
'h4',
'h5',
'h6',
'hr',
'html',
'img',
'kbd',
'ol',
'p',
'pre',
'strong',
'sup',
'table',
'ul',
].forEach((e) => expect(rules).toContain(e))
assertPurged(result)
})
})
)
})
test('preserving element selectors can be disabled', () => {
return inProduction(
suppressConsoleLogs(() => {
const inputPath = path.resolve(`${__dirname}/fixtures/tailwind-input.css`)
const input = fs.readFileSync(inputPath, 'utf8')
return postcss([
tailwind({
...config,
purge: {
content: [path.resolve(`${__dirname}/fixtures/**/*.html`)],
mode: 'all',
preserveHtmlElements: false,
},
}),
])
.process(input, { from: inputPath })
.then((result) => {
const rules = extractRules(result.root)
;[
'blockquote',
'code',
'em',
'fieldset',
'figure',
'h1',
'h2',
'h3',
'h4',
'h5',
'h6',
'hr',
'img',
'kbd',
'li',
'ol',
'pre',
'strong',
'sup',
'table',
'ul',
].forEach((e) => expect(rules).not.toContain(e))
assertPurged(result)
})
})
)
})