webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const devMode = process.env.NODE_ENV !== 'production';

module.exports = {
  entry: 'multi-entry-loader!',/* {
    app: ['./app.js', './public/styles/custom.scss', './public/styles/*.css'],
    dashboard: ['./public/dashboard/scss/style.scss'],
  }, */
  output: {
    path: path.resolve(__dirname, 'public'),
    filename: '[name].bundle.js',
  },
  devtool: 'source-map',
  output: {
    path: path.resolve(__dirname, 'public/dashboard/'),
    filename: '[name].bundle.js',
  },

  module: {
    rules: [
      /* JS */
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'babel-loader',
            options: { presets: ['env'] },
          },
        ],
      },
      /* SCSS */
      {
        test: /\.scss$/,
        use: [
          { loader: MiniCssExtractPlugin.loader },
          { loader: 'css-loader' },
          {
            // Loader for webpack to process CSS with PostCSS
            loader: 'postcss-loader',
            options: {
              plugins: function() {
                return [require('autoprefixer')];
              },
            },
          },
          { loader: 'sass-loader' },
        ],
      },
      {
        test: /\.(png|jpe?g|gif|svg|eot|ttf|woff|woff2)$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
        },
      },
    ],
  },

  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css',
    }),
  ],
};