Nuxt/lib/builder/webpack/utils/postcss.js

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import fs from 'fs'
import path from 'path'
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import _ from 'lodash'
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import createResolver from 'postcss-import-resolver'
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import { isPureObject } from '../../../common/utils'
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export default class PostcssConfig {
constructor(options, nuxt) {
this.nuxt = nuxt
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this.dev = options.dev
this.postcss = options.build.postcss
this.srcDir = options.srcDir
this.rootDir = options.rootDir
this.cssSourceMap = options.build.cssSourceMap
this.modulesDir = options.modulesDir
}
get defaultConfig() {
return {
sourceMap: this.cssSourceMap,
plugins: {
// https://github.com/postcss/postcss-import
'postcss-import': {
resolve: createResolver({
alias: {
'~': path.join(this.srcDir),
'~~': path.join(this.rootDir),
'@': path.join(this.srcDir),
'@@': path.join(this.rootDir)
},
modules: [
this.srcDir,
this.rootDir,
...this.modulesDir
]
})
},
// https://github.com/postcss/postcss-url
'postcss-url': {},
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// https://github.com/csstools/postcss-preset-env
'postcss-preset-env': this.preset || {},
'cssnano': this.dev ? false : { preset: 'default' }
}
}
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}
searchConfigFile() {
// Search for postCSS config file and use it if exists
// https://github.com/michael-ciniawsky/postcss-load-config
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for (const dir of [this.srcDir, this.rootDir]) {
for (const file of [
'postcss.config.js',
'.postcssrc.js',
'.postcssrc',
'.postcssrc.json',
'.postcssrc.yaml'
]) {
const configFile = path.resolve(dir, file)
if (fs.existsSync(configFile)) {
return configFile
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}
}
}
}
configFromFile() {
const loaderConfig = (this.postcss && this.postcss.config) || {}
loaderConfig.path = loaderConfig.path || this.searchConfigFile()
if (loaderConfig.path) {
return {
sourceMap: this.cssSourceMap,
config: loaderConfig
}
}
}
normalize(config) {
if (Array.isArray(config)) {
config = { plugins: config }
}
return config
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}
loadPlugins(config) {
const plugins = config.plugins
if (isPureObject(plugins)) {
// Map postcss plugins into instances on object mode once
config.plugins = Object.keys(plugins)
.map((p) => {
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const plugin = require(p)
const opts = plugins[p]
if (opts === false) return // Disabled
const instance = plugin(opts)
return instance
})
.filter(e => e)
}
}
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config() {
/* istanbul ignore if */
if (!this.postcss) {
return false
}
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let config = this.configFromFile()
if (config) {
return config
}
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config = this.normalize(_.cloneDeep(this.postcss))
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// Apply default plugins
if (isPureObject(config)) {
if (config.preset) {
this.preset = config.preset
delete config.preset
}
if (Array.isArray(config.plugins)) {
_.defaults(config, this.defaultConfig)
} else {
// Keep the order of default plugins
config = _.merge({}, this.defaultConfig, config)
this.loadPlugins(config)
}
return config
}
}
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}