ExtractTextPlugin は使えないから mini-css-extract-plugin を使おう（ワイメモ）

CSS のための Webpack 設定

一部情報が古かったり嘘だったりするので2018/09/19現在のメモ。

npm i -D webpack webpack-cli css-loader node-sass sass-loader postcss-loader autoprefilxer mini-css-extract-plugin optimize-css-assets-webpack-plugin

なんかいらないのも入っていていもキにしない。

{
  "devDependencies": {
    "autoprefixer": "^9.1.5",
    "css-loader": "^1.0.0",
    "mini-css-extract-plugin": "^0.4.3",
    "node-sass": "^4.9.3",
    "optimize-css-assets-webpack-plugin": "^5.0.1",
    "postcss-loader": "^3.0.0",
    "sass-loader": "^7.1.0",
    "webpack": "^4.19.1",
    "webpack-cli": "^3.1.0"
  }
}

const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");

module.exports = {
    optimization: {
        minimizer: [
            new UglifyJsPlugin({
                cache: true,
                parallel: true,
                sourceMap: true
            }),
            new OptimizeCSSAssetsPlugin({})
        ]
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: 'style.css'
        })
    ],
    mode: 'production',
    devtool: 'source-map',
    module: {
        rules: [
            {
                test: /\.scss/,
                use: [
                    MiniCssExtractPlugin.loader,
                    {
                        loader: 'css-loader',
                        options: {
                            url: false,
                            sourceMap: true,
                            minimize: true,
                            importLoaders: 2
                        },
                    },
                    {
                        loader: 'postcss-loader',
                        options: {
                            ident: 'postcss',
                            sourceMap: true,
                            plugins: [
                                require('autoprefixer')({grid: true})
                            ]
                        },
                    },
                    {
                        loader: 'sass-loader',
                        options: {
                            sourceMap: true,
                        }
                    }
                ],
            },
        ],
    },
};