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const fs = require('fs')
const path = require('path')
const findExisting = (context, files) => {
for (const file of files) {
if (fs.existsSync(path.join(context, file))) {
return file
}
}
}
module.exports = (api, options) => {
api.chainWebpack(webpackConfig => {
const getAssetPath = require('../util/getAssetPath')
const shadowMode = !!process.env.VUE_CLI_CSS_SHADOW_MODE
const isProd = process.env.NODE_ENV === 'production'
const defaultSassLoaderOptions = {}
try {
defaultSassLoaderOptions.implementation = require('sass')
defaultSassLoaderOptions.fiber = require('fibers')
} catch (e) {}
const {
modules = false,
extract = isProd,
sourceMap = false,
loaderOptions = {}
} = options.css || {}
const shouldExtract = extract !== false && !shadowMode
const filename = getAssetPath(
options,
`css/[name]${options.filenameHashing ? '.[contenthash:8]' : ''}.css`
)
const extractOptions = Object.assign({
filename,
chunkFilename: filename
}, extract && typeof extract === 'object' ? extract : {})
// use relative publicPath in extracted CSS based on extract location
const cssPublicPath = process.env.VUE_CLI_BUILD_TARGET === 'lib'
// in lib mode, CSS is extracted to dist root.
? './'
: '../'.repeat(
extractOptions.filename
.replace(/^\.[\/\\]/, '')
.split(/[\/\\]/g)
.length - 1
)
// check if the project has a valid postcss config
// if it doesn't, don't use postcss-loader for direct style imports
// because otherwise it would throw error when attempting to load postcss config
const hasPostCSSConfig = !!(loaderOptions.postcss || api.service.pkg.postcss || findExisting(api.resolve('.'), [
'.postcssrc',
'.postcssrc.js',
'postcss.config.js',
'.postcssrc.yaml',
'.postcssrc.json'
]))
// if building for production but not extracting CSS, we need to minimize
// the embbeded inline CSS as they will not be going through the optimizing
// plugin.
const needInlineMinification = isProd && !shouldExtract
const cssnanoOptions = {
preset: ['default', {
mergeLonghand: false,
cssDeclarationSorter: false
}]
}
if (options.productionSourceMap && sourceMap) {
cssnanoOptions.map = { inline: false }
}
function createCSSRule (lang, test, loader, options) {
const baseRule = webpackConfig.module.rule(lang).test(test)
// rules for <style lang="module">
const vueModulesRule = baseRule.oneOf('vue-modules').resourceQuery(/module/)
applyLoaders(vueModulesRule, true)
// rules for <style>
const vueNormalRule = baseRule.oneOf('vue').resourceQuery(/\?vue/)
applyLoaders(vueNormalRule, false)
// rules for *.module.* files
const extModulesRule = baseRule.oneOf('normal-modules').test(/\.module\.\w+$/)
applyLoaders(extModulesRule, true)
// rules for normal CSS imports
const normalRule = baseRule.oneOf('normal')
applyLoaders(normalRule, modules)
function applyLoaders (rule, modules) {
if (shouldExtract) {
rule
.use('extract-css-loader')
.loader(require('mini-css-extract-plugin').loader)
.options({
publicPath: cssPublicPath
})
} else {
rule
.use('vue-style-loader')
.loader('vue-style-loader')
.options({
sourceMap,
shadowMode
})
}
const cssLoaderOptions = Object.assign({
sourceMap,
importLoaders: (
1 + // stylePostLoader injected by vue-loader
(hasPostCSSConfig ? 1 : 0) +
(needInlineMinification ? 1 : 0)
)
}, loaderOptions.css)
if (modules) {
const {
localIdentName = '[name]_[local]_[hash:base64:5]'
} = loaderOptions.css || {}
Object.assign(cssLoaderOptions, {
modules,
localIdentName
})
}
rule
.use('css-loader')
.loader('css-loader')
.options(cssLoaderOptions)
if (needInlineMinification) {
rule
.use('cssnano')
.loader('postcss-loader')
.options({
sourceMap,
plugins: [require('cssnano')(cssnanoOptions)]
})
}
if (hasPostCSSConfig) {
rule
.use('postcss-loader')
.loader('postcss-loader')
.options(Object.assign({ sourceMap }, loaderOptions.postcss))
}
if (loader) {
rule
.use(loader)
.loader(loader)
.options(Object.assign({ sourceMap }, options))
}
}
}
createCSSRule('css', /\.css$/)
createCSSRule('postcss', /\.p(ost)?css$/)
createCSSRule('scss', /\.scss$/, 'sass-loader', Object.assign(defaultSassLoaderOptions, loaderOptions.sass))
createCSSRule('sass', /\.sass$/, 'sass-loader', Object.assign(defaultSassLoaderOptions, {
indentedSyntax: true
}, loaderOptions.sass))
createCSSRule('less', /\.less$/, 'less-loader', loaderOptions.less)
createCSSRule('stylus', /\.styl(us)?$/, 'stylus-loader', Object.assign({
preferPathResolver: 'webpack'
}, loaderOptions.stylus))
// inject CSS extraction plugin
if (shouldExtract) {
webpackConfig
.plugin('extract-css')
.use(require('mini-css-extract-plugin'), [extractOptions])
// minify extracted CSS
if (isProd) {
webpackConfig
.plugin('optimize-css')
.use(require('@intervolga/optimize-cssnano-plugin'), [{
sourceMap: options.productionSourceMap && sourceMap,
cssnanoOptions
}])
}
}
})
}