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const path = require('path')
const { getOptions } = require('loader-utils')
const validateOptions = require('schema-utils')
const postcss = require('postcss')
const postcssrc = require('postcss-load-config')
const Warning = require('./Warning.js')
const SyntaxError = require('./Error.js')
const parseOptions = require('./options.js')
/**
* **PostCSS Loader**
*
* Loads && processes CSS with [PostCSS](https://github.com/postcss/postcss)
*
* @method loader
*
* @param {String} css Source
* @param {Object} map Source Map
*
* @return {cb} cb Result
*/
function loader (css, map, meta) {
const options = Object.assign({}, getOptions(this))
validateOptions(require('./options.json'), options, 'PostCSS Loader')
const cb = this.async()
const file = this.resourcePath
const sourceMap = options.sourceMap
Promise.resolve().then(() => {
const length = Object.keys(options)
.filter((option) => {
switch (option) {
// case 'exec':
case 'ident':
case 'config':
case 'sourceMap':
return
default:
return option
}
})
.length
if (length) {
return parseOptions.call(this, options)
}
const rc = {
path: path.dirname(file),
ctx: {
file: {
extname: path.extname(file),
dirname: path.dirname(file),
basename: path.basename(file)
},
options: {}
}
}
if (options.config) {
if (options.config.path) {
rc.path = path.resolve(options.config.path)
}
if (options.config.ctx) {
rc.ctx.options = options.config.ctx
}
}
rc.ctx.webpack = this
return postcssrc(rc.ctx, rc.path)
}).then((config) => {
if (!config) {
config = {}
}
if (config.file) {
this.addDependency(config.file)
}
// Disable override `to` option from `postcss.config.js`
if (config.options.to) {
delete config.options.to
}
// Disable override `from` option from `postcss.config.js`
if (config.options.from) {
delete config.options.from
}
let plugins = config.plugins || []
let options = Object.assign({
from: file,
map: sourceMap
? sourceMap === 'inline'
? { inline: true, annotation: false }
: { inline: false, annotation: false }
: false
}, config.options)
// Loader Exec (Deprecated)
// https://webpack.js.org/api/loaders/#deprecated-context-properties
if (options.parser === 'postcss-js') {
css = this.exec(css, this.resource)
}
if (typeof options.parser === 'string') {
options.parser = require(options.parser)
}
if (typeof options.syntax === 'string') {
options.syntax = require(options.syntax)
}
if (typeof options.stringifier === 'string') {
options.stringifier = require(options.stringifier)
}
// Loader API Exec (Deprecated)
// https://webpack.js.org/api/loaders/#deprecated-context-properties
if (config.exec) {
css = this.exec(css, this.resource)
}
if (sourceMap && typeof map === 'string') {
map = JSON.parse(map)
}
if (sourceMap && map) {
options.map.prev = map
}
return postcss(plugins)
.process(css, options)
.then((result) => {
let { css, map, root, processor, messages } = result
result.warnings().forEach((warning) => {
this.emitWarning(new Warning(warning))
})
messages.forEach((msg) => {
if (msg.type === 'dependency') {
this.addDependency(msg.file)
}
})
map = map ? map.toJSON() : null
if (map) {
map.file = path.resolve(map.file)
map.sources = map.sources.map((src) => path.resolve(src))
}
if (!meta) {
meta = {}
}
const ast = {
type: 'postcss',
version: processor.version,
root
}
meta.ast = ast
meta.messages = messages
if (this.loaderIndex === 0) {
/**
* @memberof loader
* @callback cb
*
* @param {Object} null Error
* @param {String} css Result (JS Module)
* @param {Object} map Source Map
*/
cb(null, `module.exports = ${JSON.stringify(css)}`, map)
return null
}
/**
* @memberof loader
* @callback cb
*
* @param {Object} null Error
* @param {String} css Result (Raw Module)
* @param {Object} map Source Map
*/
cb(null, css, map, meta)
return null
})
}).catch((err) => {
if (err.file) {
this.addDependency(err.file)
}
return err.name === 'CssSyntaxError'
? cb(new SyntaxError(err))
: cb(err)
})
}
/**
* @author Andrey Sitnik (@ai) <andrey@sitnik.ru>
*
* @license MIT
* @version 3.0.0
*
* @module postcss-loader
*
* @requires path
*
* @requires loader-utils
* @requires schema-utils
*
* @requires postcss
* @requires postcss-load-config
*
* @requires ./options.js
* @requires ./Warning.js
* @requires ./SyntaxError.js
*/
module.exports = loader