Create a prod webpack config

package.json

@@ -52,7 +52,8 @@
     "zmodem.js": "^0.1.5"
   },
   "scripts": {
-    "lib2": "webpack",
+    "package": "webpack",
+    "package-prod": "webpack --config webpack.prod.js",
     "start": "node demo/start",
     "start-debug": "node --inspect-brk demo/start",
     "start-zmodem": "node demo/zmodem/app",
@@ -67,7 +68,7 @@
     "prebuild": "tsc -b ./src/tsconfig.all.json",
     "build": "gulp build",
     "prepare": "npm run prebuild",
-    "prepublishOnly": "npm run build",
+    "prepublishOnly": "npm run package-prod",
     "coveralls": "nyc report --reporter=text-lcov | coveralls",
     "watch": "tsc -b -w ./src/tsconfig.all.json --preserveWatchOutput"
   }

webpack.prod.js

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2019 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+const path = require('path');
+
+module.exports = {
+  entry: './out/public/Terminal.js',
+  resolve: {
+    modules: ['./node_modules'],
+    extensions: [ '.js' ],
+    alias: {
+      common: path.resolve('./out/common'),
+      core: path.resolve('./out/core')
+    }
+  },
+  output: {
+    filename: 'xterm.js',
+    path: path.resolve('./lib'),
+    library: 'Terminal',
+    libraryTarget: 'umd'
+  },
+  mode: 'production'
+};