webpack.config.js

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

module.exports = {
  mode: 'none',
  entry: ['./source/javascripts/main.js', './source/stylesheets/main.scss'],
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'tmp/webpack')
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        include: path.resolve(__dirname, 'source/javascripts'),
        loader: 'babel-loader',
        options: {
          presets: [
            '@babel/preset-env'
          ]
        }
      },
      {
        test: /\.(gif|svg|jpg|png)$/,
        loader: 'url-loader',
        options: {
          limit: 10000
        }
      },
      {
        test: /\.scss$/,
        include: path.resolve(__dirname, 'source/stylesheets'),
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          {
            loader: 'postcss-loader',
            options: {
              postcssOptions: {
                plugins: () => [autoprefixer()]
              }
            }
          },
          {
            loader: 'sass-loader',
            options: {
              implementation: require('sass')
            }
          }
        ]
      },
      {
        test: /\.(woff(2)?|ttf|eot|svg|otf)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        loader: 'url-loader',
        options: {
          name: 'fonts/[name].[ext]?[hash]'
        }
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'bundle.css',
    })
  ]
};