webpack如何打包编译成单独css文件

const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
    plugins: [new MiniCssExtractPlugin()],
    module: {
        rules: [
            {test: /\.css$/, use: [MiniCssExtractPlugin.loader, 'css-loader']},
            {test: /\.less$/, use: [MiniCssExtractPlugin.loader, 'css-loader', 'less-loader']},
        ]
    },
};

$ webpack 编译