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const tailwind = require('./tailwind.config')
const { resolve } = require('path')
const { writeFileSync } = require('fs')
module.exports = ({ mode }) => ({
ident: 'postcss',
sourceMap: mode !== 'production',
plugins: [
require('postcss-import'),
buildBlockList,
require('tailwindcss')({
...tailwind,
config: resolve(__dirname, 'tailwind.config.js'),
}),
(css) =>
css.walkRules((rule) => {
// Removes top level TW styles like *::before {}
rule.selector.startsWith('*') && rule.remove()
}),
extractSuggestions,
appendNots,
// See: https://github.com/WordPress/gutenberg/blob/trunk/packages/postcss-plugins-preset/lib/index.js
require('autoprefixer')({ grid: true }),
mode === 'production' &&
// See: https://github.com/WordPress/gutenberg/blob/trunk/packages/scripts/config/webpack.config.js#L68
require('cssnano')({
preset: [
'default',
{
discardComments: {
removeAll: true,
},
},
],
}),
require('postcss-safe-important'),
],
})
const blockList = new Set()
const buildBlockList = (css) => {
css.walkRules((rule) => {
// Allows us to ignore some rules from being processed/purged
if (
rule?.nodes.find(
(n) => n.type === 'comment' && n.text === 'no suggestion',
)
) {
blockList.add(rule.selector.replace('.', '').split(' ')[0])
}
})
}
const extractSuggestions = (css) => {
const classesToExclude = [...blockList]
const data = {
notes: 'This file is generated in postcss.config.js. Do not edit directly.',
suggestions: [],
}
css.walkRules((rule) => {
data.suggestions.push(
rule.selector
.replace('.', '')
.replace(new RegExp(':not\\(([^\\)]*)\\)'), '')
.split(/ |.wp-/)[0],
)
})
try {
data.suggestions = [...new Set(data.suggestions)].filter(
(c) => !classesToExclude.find((e) => e.trim() === c.trim()),
)
writeFileSync(
resolve(__dirname, 'suggestions.json'),
JSON.stringify(data, null, 4),
)
} catch (error) {
console.error(error)
}
return css
}
const appendNots = (css) => {
css.walkRules((rule) => {
// This appends the :not() exception to padding and margins
;(new RegExp('[:]?[^a-z]-?p[a-z]?-.+').test(rule) &&
(rule.selector += ':not([style*="padding"])')) ||
(new RegExp('[:]?[^a-z]-?m[a-z]?-.+').test(rule) &&
(rule.selector += ':not([style*="margin"])'))
})
}