Upgrade to Webpack 4 (including webpack-dev-server). Add ES6 support via Babel 7.

package.json

@@ -1,11 +1,11 @@
 {
   "name": "phaser3-project-template",
-  "version": "1.0.4",
+  "version": "1.1.0",
   "description": "A Phaser 3 Project Template",
   "main": "src/index.js",
   "scripts": {
-    "build": "webpack",
-    "start": "webpack-dev-server"
+    "build": "webpack --config webpack/prod.js",
+    "start": "webpack-dev-server --config webpack/base.js --open"
   },
   "repository": {
     "type": "git",
@@ -19,10 +19,21 @@
   },
   "homepage": "https://github.com/photonstorm/phaser3-project-template#readme",
   "devDependencies": {
-    "webpack-dev-server": "^2.11.0",
-    "webpack": "^3.4.1"
+    "@babel/core": "^7.2.2",
+    "@babel/preset-env": "^7.2.3",
+    "babel-loader": "^8.0.5",
+    "clean-webpack-plugin": "^1.0.0",
+    "file-loader": "^3.0.1",
+    "html-webpack-plugin": "^3.2.0",
+    "image-webpack-loader": "^4.6.0",
+    "raw-loader": "^1.0.0",
+    "terser-webpack-plugin": "^1.2.1",
+    "webpack": "^4.28.3",
+    "webpack-cli": "^3.2.1",
+    "webpack-dev-server": "^3.1.14",
+    "webpack-merge": "^4.2.1"
   },
   "dependencies": {
-    "phaser": "^3.0.0-beta.20"
+    "phaser": "^3.15.1"
   }
 }