webpack4从0开始构建前端单页项目(13)用optimize-css-assets-webpack-plugin压缩css

optimize-css-assets-webpack-plugin这个插件用来压缩css文件。去掉css文件中的换行和空格。optimize-css-assets-webpack-plugin内置了cssnano,安装了optimize-css-assets-webpack-plugin就不用在安装cssnano。

安装optimize-css-assets-webpack-plugin

    cnpm i optimize-css-assets-webpack-plugin -D

配置optimize-css-assets-webpack-plugin

\\ webpack.config.js
    const webpack = require("webpack");
    const path = require("path");
    const htmlWebpackPlugin = require("html-webpack-plugin");
    const MiniCssExtractPlugin = require("mini-css-extract-plugin");
    const optimizeCssAssetsWebpackPlugin = require("optimize-css-assets-webpack-plugin"); //引入压缩css的插件

    module.exports = {
        entry: "./src/main.js",
        mode: "development",
        output: {
            path: path.join(__dirname, "dist"),
            filename: "app.[hash:16].js",
        },
        plugins: [
            new MiniCssExtractPlugin({
                filename: "[name].css",
                ignoreOrder: false,
            }),
            new htmlWebpackPlugin({
                filename: "index.html",
                template: "./public/index.html",
                minify: {
                    collapseWhitespace: true,
                    html5: true,
                },
                inject: true,
            }),
            new optimizeCssAssetsWebpackPlugin({ // 配置  optimize-css-assets-webpack-plugin
                assetNameRegExp: /\.css$/g,
                cssProcessor: require("cssnano"), // 如果报错 安装 cnpm i cssnano -D
            }),
        ],
        devServer: {
            contentBase: path.join(__dirname, "dist"),
            compress: true,
            port: 9000, // 配置端口
            hot: true,
        },

        module: {
            rules: [
                {
                    test: /\.js$/,
                    exclude: /(node_modules|bower_components)/,
                    use: "babel-loader",
                },
                {
                    test: /\.css$/,
                    use: [
                        MiniCssExtractPlugin.loader,
                        "css-loader",
                        "postcss-loader",
                    ],
                },
            ],
        },
    };

optimize-css-assets-webpack-plugin 参考: https://github.com/NMFR/optimize-css-assets-webpack-plugin

cssnano 参考: https://github.com/cssnano/cssnano