Update to webpack 4

- Remove unused base64-loader

package.json

@@ -26,12 +26,11 @@
   "devDependencies": {
     "babel-core": "^6.23.1",
     "babel-eslint": "^8.2.1",
-    "babel-loader": "^7.1.2",
+    "babel-loader": "^7.1.4",
     "babel-polyfill": "^6.22.0",
     "babel-preset-es2015": "^6.22.0",
-    "base64-loader": "^1.0.0",
     "chromeless": "^1.5.1",
-    "copy-webpack-plugin": "^4.0.1",
+    "copy-webpack-plugin": "^4.5.1",
     "docdash": "^0.4.0",
     "eslint": "^4.6.1",
     "eslint-config-scratch": "^5.0.0",
@@ -49,8 +48,10 @@
     "tap": "^11.0.0",
     "travis-after-all": "^1.4.4",
     "twgl.js": "4.4.0",
-    "webpack": "^3.10.0",
-    "webpack-dev-server": "^2.8.2",
+    "uglifyjs-webpack-plugin": "^1.2.5",
+    "webpack": "^4.8.0",
+    "webpack-cli": "^2.0.15",
+    "webpack-dev-server": "^3.1.4",
     "xml-escape": "1.1.0"
   }
 }

webpack.config.js

@@ -1,8 +1,9 @@
 const CopyWebpackPlugin = require('copy-webpack-plugin');
 const path = require('path');
-const webpack = require('webpack');
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
 
 const base = {
+    mode: process.env.NODE_ENV === 'production' ? 'production' : 'development',
     devServer: {
         contentBase: false,
         host: '0.0.0.0',
@@ -27,12 +28,14 @@ const base = {
             }
         ]
     },
-    plugins: process.env.NODE_ENV === 'production' ? [
-        new webpack.optimize.UglifyJsPlugin({
-            include: /\.min\.js$/,
-            minimize: true
-        })
-    ] : []
+    optimization: {
+        minimizer: [
+            new UglifyJsPlugin({
+                include: /\.min\.js$/
+            })
+        ]
+    },
+    plugins: []
 };
 
 module.exports = [