gistfile1.txt

const webpack = require('webpack');
const merge = require('webpack-merge');
const common = require('./webpack.common.js');

const UglifyJSPlugin = require('uglifyjs-webpack-plugin');

module.exports = merge(common, {
  devtool: 'source-map',
  plugins: [
    new UglifyJSPlugin({
      sourceMap: true
    }),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production')
    })
  ]
});

package.json

{
  "name": "rwp-web",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack --config webpack.prod.js",
    "start": "webpack-dev-server --open --config webpack.dev.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "aos": "^2.2.0",
    "babel-cli": "^6.26.0",
    "clean-webpack-plugin": "^0.1.17",
    "css-loader": "^0.28.7",
    "file-loader": "^1.1.5",
    "google-fonts-webpack-plugin": "^0.4.3",
    "google-maps": "^3.2.1",
    "html-webpack-plugin": "^2.30.1",
    "jquery": "^3.2.1",
    "jquery-scrollify": "^1.0.17",
    "jquery.easing": "^1.4.1",
    "node-sass": "^4.7.2",
    "normalize.css": "^7.0.0",
    "postcss": "^6.0.14",
    "postcss-animations": "^0.3.0",
    "postcss-font-magician": "^2.1.0",
    "postcss-loader": "^2.0.9",
    "precss": "^2.0.0",
    "sass-loader": "^6.0.6",
    "style-loader": "^0.19.0",
    "uglifyjs-webpack-plugin": "^1.1.2",
    "webpack": "^3.10.0",
    "webpack-dev-server": "^2.9.5",
    "webpack-merge": "^4.1.1"
  },
  "dependencies": {
    "babel-core": "^6.26.0",
    "babel-loader": "^7.1.2",
    "babel-preset-env": "^1.6.1"
  }
}

webpack.common.js

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

module.exports = {
  entry: {
    app: './src/index.js'
  },
  plugins: [
    new HtmlWebpackPlugin({
      title: 'Route One Power'
    }),
  ],
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              importLoaders: 1
            }
          },
          'postcss-loader',
        ]
      },
      {
        test: /\.scss$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              importLoaders: 1
            }
          },
          'postcss-loader',
          'sass-loader'
        ]
      },
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              presets: ['babel-preset-env'],
            }
          }
        ]
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        use: [
          'file-loader'
        ]
      },
      {
        test: /\.(woff|woff2|eot|ttf|otf)$/,
        use: [
          'file-loader'
        ]
      },
    ]
  },
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname + 'dist/'),
  },
}