chore(pacakge): bump webpack

package.json

@@ -32,7 +32,7 @@
     "@types/lodash": "^4.14.105",
     "@types/node": "8.0.47",
     "@types/rimraf": "^2.0.2",
-    "@types/webpack": "^3.8.1",
+    "@types/webpack": "^4.1.1",
     "async-promise-queue": "^1.0.4",
     "babel-core": "^6.26.0",
     "babel-preset-env": "^1.6.1",
@@ -63,9 +63,9 @@
     "tslint": "5.8.0",
     "tslint-ionic-rules": "0.0.11",
     "typescript": "2.6.2",
-    "uglifyjs-webpack-plugin": "^1.1.2",
-    "unminified-webpack-plugin": "^1.4.2",
-    "webpack": "^3.9.1",
+    "uglifyjs-webpack-plugin": "^1.2.4",
+    "unminified-webpack-plugin": "^2.0.0",
+    "webpack": "^4.1.1",
     "winston": "^3.0.0-rc1",
     "zone.js": "^0.8.20"
   },

scripts/tasks/build-es5.ts

@@ -15,6 +15,7 @@ const INJECTABLE_CLASSES = fs.readJSONSync(EMIT_PATH).map((item: InjectableClass
 });
 
 const webpackConfig: webpack.Configuration = {
+  mode: 'production',
   entry: INDEX_PATH,
   devtool: 'source-map',
   target: 'web',