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purgeUnusedStyles.js
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purgeUnusedStyles.js
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import _ from 'lodash'
import postcss from 'postcss'
import purgecss from '@fullhuman/postcss-purgecss'
import log from '../util/log'
import htmlTags from 'html-tags'
import path from 'path'
function removeTailwindMarkers(css) {
css.walkAtRules('tailwind', (rule) => rule.remove())
css.walkComments((comment) => {
switch (comment.text.trim()) {
case 'tailwind start base':
case 'tailwind end base':
case 'tailwind start components':
case 'tailwind start utilities':
case 'tailwind end components':
case 'tailwind end utilities':
comment.remove()
break
default:
break
}
})
}
export function tailwindExtractor(content) {
// Capture as liberally as possible, including things like `h-(screen-1.5)`
const broadMatches = content.match(/[^<>"'`\s]*[^<>"'`\s:]/g) || []
const broadMatchesWithoutTrailingSlash = broadMatches.map((match) => _.trimEnd(match, '\\'))
// Capture classes within other delimiters like .block(class="w-1/2") in Pug
const innerMatches = content.match(/[^<>"'`\s.(){}[\]#=%]*[^<>"'`\s.(){}[\]#=%:]/g) || []
return broadMatches.concat(broadMatchesWithoutTrailingSlash).concat(innerMatches)
}
function getTransformer(config, fileExtension) {
let transformers = (config.purge && config.purge.transform) || {}
if (typeof transformers === 'function') {
transformers = {
DEFAULT: transformers,
}
}
return transformers[fileExtension] || transformers.DEFAULT || ((content) => content)
}
export default function purgeUnusedUtilities(config, configChanged, resolvedConfigPath) {
const purgeEnabled = _.get(
config,
'purge.enabled',
config.purge !== false && config.purge !== undefined && process.env.NODE_ENV === 'production'
)
if (!purgeEnabled) {
return removeTailwindMarkers
}
// Skip if `purge: []` since that's part of the default config
if (Array.isArray(config.purge) && config.purge.length === 0) {
if (configChanged) {
log.warn([
'Tailwind is not purging unused styles because no template paths have been provided.',
'If you have manually configured PurgeCSS outside of Tailwind or are deliberately not removing unused styles, set `purge: false` in your Tailwind config file to silence this warning.',
'https://tailwindcss.com/docs/controlling-file-size/#removing-unused-css',
])
}
return removeTailwindMarkers
}
const extractors = config.purge.extract || {}
const transformers = config.purge.transform || {}
let { defaultExtractor: originalDefaultExtractor, ...purgeOptions } = config.purge.options || {}
if (!originalDefaultExtractor) {
originalDefaultExtractor =
typeof extractors === 'function' ? extractors : extractors.DEFAULT || tailwindExtractor
}
const defaultExtractor = (content) => {
const preserved = originalDefaultExtractor(content)
if (_.get(config, 'purge.preserveHtmlElements', true)) {
preserved.push(...htmlTags)
}
return preserved
}
// If `extractors` is a function then we don't have any file-specific extractors,
// only a default one.
let fileSpecificExtractors = typeof extractors === 'function' ? {} : extractors
// PurgeCSS doesn't support "transformers," so we implement those using extractors.
// If we have a custom transformer for an extension, but not a matching extractor,
// then we need to create an extractor that we can augment later.
if (typeof transformers !== 'function') {
for (let [extension] of Object.entries(transformers)) {
if (!fileSpecificExtractors[extension]) {
fileSpecificExtractors[extension] = defaultExtractor
}
}
}
// Augment file-specific extractors by running the transformer before we extract classes.
fileSpecificExtractors = Object.entries(fileSpecificExtractors).map(([extension, extractor]) => {
return {
extensions: [extension],
extractor: (content) => {
const transformer = getTransformer(config, extension)
return extractor(transformer(content))
},
}
})
return postcss([
function (css) {
const mode = _.get(config, 'purge.mode', 'layers')
if (!['all', 'layers'].includes(mode)) {
throw new Error('Purge `mode` must be one of `layers` or `all`.')
}
if (mode === 'all') {
return
}
const layers = _.get(config, 'purge.layers', ['base', 'components', 'utilities'])
css.walkComments((comment) => {
switch (comment.text.trim()) {
case `purgecss start ignore`:
comment.before(postcss.comment({ text: 'purgecss end ignore' }))
break
case `purgecss end ignore`:
comment.before(postcss.comment({ text: 'purgecss end ignore' }))
comment.text = 'purgecss start ignore'
break
default:
break
}
layers.forEach((layer) => {
switch (comment.text.trim()) {
case `tailwind start ${layer}`:
comment.text = 'purgecss end ignore'
break
case `tailwind end ${layer}`:
comment.text = 'purgecss start ignore'
break
default:
break
}
})
})
css.prepend(postcss.comment({ text: 'purgecss start ignore' }))
css.append(postcss.comment({ text: 'purgecss end ignore' }))
},
removeTailwindMarkers,
purgecss({
defaultExtractor: (content) => {
const transformer = getTransformer(config)
return defaultExtractor(transformer(content))
},
extractors: fileSpecificExtractors,
...purgeOptions,
content: (Array.isArray(config.purge)
? config.purge
: config.purge.content || purgeOptions.content || []
).map((item) => {
if (typeof item === 'string') {
return path.resolve(
resolvedConfigPath ? path.dirname(resolvedConfigPath) : process.cwd(),
item
)
}
return item
}),
}),
])
}