Nuxt/lib/builder/webpack/utils/style-loader.js

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import MiniCssExtractPlugin from 'mini-css-extract-plugin'
import PostcssConfig from './postcss'
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export default class StyleLoader {
constructor(options, nuxt, { isServer }) {
this.isServer = isServer
this.dev = options.dev
this.srcDir = options.srcDir
this.assetsDir = options.dir.assets
this.staticDir = options.dir.static
this.loaders = options.build.loaders
this.extractCSS = options.build.extractCSS
this.resources = options.build.styleResources
this.sourceMap = Boolean(options.build.cssSourceMap)
if (options.build.postcss) {
this.postcssConfig = new PostcssConfig(options, nuxt)
}
}
normalize(loaders) {
loaders = Array.isArray(loaders) ? loaders : [loaders]
return loaders.map(loader => (typeof loader === 'string' ? { loader } : loader))
}
styleResource(ext) {
const extResource = this.resources[ext]
// style-resources-loader
// https://github.com/yenshih/style-resources-loader
if (extResource) {
const patterns = Array.isArray(extResource)
? extResource
: [extResource]
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return {
loader: 'style-resources-loader',
options: Object.assign(
{ patterns },
this.resources.options || {}
)
}
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}
}
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postcss() {
// postcss-loader
// https://github.com/postcss/postcss-loader
if (this.postcssConfig) {
const config = this.postcssConfig.config()
if (config) {
return {
loader: 'postcss-loader',
options: Object.assign({ sourceMap: this.sourceMap }, config)
}
}
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}
}
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css(options) {
return {
loader: (this.isServer && this.extractCSS) ? 'css-loader/locals' : 'css-loader',
options
}
}
cssModules(options) {
options.modules = true
return this.css(options)
}
extract() {
if (this.extractCSS && !this.isServer) {
return MiniCssExtractPlugin.loader
}
}
vueStyle() {
// https://github.com/vuejs/vue-style-loader
return {
loader: 'vue-style-loader',
options: this.loaders.vueStyle
}
}
apply(ext, loaders = []) {
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const customLoaders = [].concat(
this.postcss(loaders),
this.normalize(loaders),
this.styleResource(ext)
).filter(Boolean)
const { css: cssOptions, cssModules: cssModulesOptions } = this.loaders
cssOptions.importLoaders = cssModulesOptions.importLoaders = customLoaders.length
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const styleLoader = this.extract() || this.vueStyle()
return [
// This matches <style module>
{
resourceQuery: /module/,
use: [].concat(
styleLoader,
this.cssModules(cssModulesOptions),
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customLoaders
)
},
// This matches plain <style> or <style scoped>
{
use: [].concat(
styleLoader,
this.css(cssOptions),
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customLoaders
)
}
]
}
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}