webpack.common.js

const path = require('path');
const webpack = require('webpack');

module.exports = {
  entry: {
    app: './src/app/index.js'
  },
  plugins: [
    new webpack.DefinePlugin({
      ENV: JSON.stringify(process.env.NODE_ENV === 'production' ? 'production' : 'development')
    })
  ],  
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname, 'dist')
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /(node_modules)/,
        use: {
          loader: 'babel-loader'
        }
      },      
      { test: /\.scss$/,
        use: [
          { loader: 'style-loader' }, 
          { loader: 'css-loader' },
          { loader: 'sass-loader' }
        ]
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        use: [
          'file-loader'
        ]
      },
      {
        test: /\.(woff|woff2|eot|ttf|otf)$/,
        use: [
          'file-loader'
        ]
      }
    ]
  }
};