webpack.config.js

const path = require('path');

module.exports = {
  entry: path.join(__dirname, 'src', 'index.js'),
  output: {
    path: path.join(__dirname, 'public'),
    filename: 'bundle.js',
  },
  devServer: {
    contentBase: path.join(__dirname, 'public'),
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.(sa|sc|c)ss$/,
        use: [{
          loader: 'style-loader',
        }, {
          loader: 'css-loader',
          options: {
            sourceMap: true,
          },
        }, {
          loader: 'sass-loader',
          options: {
            sourceMap: true,
          },
        }],
      },
    ],
  },
};