css - sass-loader和ExtractTextPlugin完成后如何运行POSTCSS？

我试图弄清楚如何在最终的输出CSS文件上运行postcss。

'strict';

const path = require('path');
const webpack = require('webpack');
const StatsPlugin = require('stats-webpack-plugin');

/* POSTCSS Optimizations of CSS files */
const clean = require('postcss-clean');
const colorMin = require('postcss-colormin');
const discardDuplicates = require('postcss-discard-duplicates');
const discardEmpty = require('postcss-discard-empty');
const mergeRules = require('postcss-merge-rules');
const mergeLonghand = require('postcss-merge-longhand');
const minifyFonts = require('postcss-minify-font-values');
const orderedValues = require('postcss-ordered-values');
const uniqueSelectors = require('postcss-unique-selectors');

/* EXTRACT CSS for optimization and parallel loading */
const ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
    entry: './src/index',
    output: {
        path: path.join(__dirname, 'dist'),
        filename: '[name].js',
        chunkFilename: '[id].bundle.js',
        publicPath: '/dist/',
        soureMapFilename: '[file].map'
    },
    plugins: [
        new webpack.optimize.OccurenceOrderPlugin(),
        new webpack.NoErrorsPlugin(),
        new StatsPlugin('stats.json'),
        new ExtractTextPlugin('assets/css/[name].css?[hash]-[chunkhash]-[contenthash]-[name]', {
            disable: false,
            allChunks: true
        })
    ],
    node: {
        net: 'empty',
        tls: 'empty',
        dns: 'empty'
    },
    module: {
        loaders: [{
            test: /\.js$/,
            loaders: ['babel'],
            exclude: /node_modules/,
            include: __dirname
        },
        {
            test: /\.scss$/i,
            loader: ExtractTextPlugin.extract('style', ['css', 'postcss', 'sass'])
        },
        {
            test: /\.css$/,
            loader: ExtractTextPlugin.extract('style', ['css'])
        },
        {
            test: /\.(eot|woff|woff2|ttf|svg|png|jpg)$/,
            loader: 'url-loader?limit=30000&name=[name]-[hash].[ext]'
        }]
    },
    postcss() {
        return [mergeRules, mergeLonghand, colorMin, clean, discardEmpty,
                orderedValues, minifyFonts, uniqueSelectors, discardDuplicates];
    },
    sassLoader: {
        includePaths: [path.resolve(__dirname, './node_modules')]
    }
};

我当前的配置在编译所有依赖的SASS并将其和静态CSS导入并使用ExtractTextPlugin提取它们时效果很好。

看来我可以在CSS块上运行POSTCSS优化，但不能在最终产品上运行。这意味着我无法摆脱重复的CSS规则。

在sass-loader和extractTextPlugin成功发挥作用之后，如何在最终状态CSS文件上运行POSTCSS？

最佳答案

我在使用ExtractTextPlugin进行类似设置时遇到问题，而我的问题是如何使用ExtractTextPlugin插件。

我仅将其用于生产版本，这对我有用:

module: {
    loaders: [
        {   // styles
            test: /\.scss$/,
            include: [ path.join(__dirname, 'source/styles') ],
            loader: ExtractTextPlugin.extract('style', ['css', 'postcss', 'sass'])
        }
    ]
},

注意['css'，'postcss'，'sass']的数组。那就是我所缺少的部分。该数组将首先解析，然后运行样式，该样式最终将由插件提取。

而且，在插件数组上，我使用new ExtractTextPlugin('styles-[chunkhash].css')。