webpack.config.js

const autoprefixer = require('autoprefixer');
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
    
  entry: ['./src/style.scss', './src/index.js'],
  output: {
    filename: 'bundle.js',
      path: path.resolve(__dirname, 'dist')
  },
    
    devtool: 'inline-source-map',
    devServer: {
    contentBase: './dist',
    },
  module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: 'bundle.css',
            },
          },
          {loader: 'extract-loader'},
          {loader: 'css-loader'},
          {loader: 'postcss-loader',
            options: {
              plugins: () => [autoprefixer()],
            },
          },
          {
            loader: 'sass-loader',
            options: {
              includePaths: ['./node_modules'],
            },
          }
        ],
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        query: {
          presets: ['es2015'],
        },
      }
    ],
  },
};