Actually build react-dom file with the build

.eslintignore

@@ -16,3 +16,4 @@ packages/react-codemod/test/
 packages/react-codemod/scripts/
 packages/react-codemod/build/
 packages/react-codemod/node_modules/
+vendor/react-dom.js

Gruntfile.js

@@ -107,6 +107,7 @@ module.exports = function(grunt) {
     'build-modules',
     'npm-react:release',
   ]);
+  grunt.registerTask('build:react-dom', require('./grunt/tasks/react-dom'));
 
   grunt.registerTask('test', ['jest']);
   grunt.registerTask('npm:test', ['build', 'npm:pack']);
@@ -124,6 +125,7 @@ module.exports = function(grunt) {
     'browserify:addons',
     'browserify:min',
     'browserify:addonsMin',
+    'build:react-dom',
     'npm-react:release',
     'npm-react:pack',
     'npm-react-dom:pack',

grunt/tasks/react-dom.js

@@ -0,0 +1,27 @@
+'use strict';
+
+var grunt = require('grunt');
+var UglifyJS = require('uglify-js');
+
+var LICENSE_TEMPLATE =
+  grunt.file.read('./grunt/data/header-template-extended.txt');
+
+module.exports = function() {
+  var templateData = {
+    package: 'ReactDOM',
+    version: grunt.config.data.pkg.version,
+  };
+  var header = grunt.template.process(
+    LICENSE_TEMPLATE,
+    {data: templateData}
+  );
+  var src = grunt.file.read('vendor/react-dom.js');
+  grunt.file.write(
+    'build/react-dom.js',
+    header + src
+  );
+  grunt.file.write(
+    'build/react-dom.min.js',
+    header + UglifyJS.minify(src, {fromString: true}).code
+  );
+};

src/React.js

@@ -64,4 +64,6 @@ assign(React, {
   ),
 });
 
+React.__SECRET_DOM_DO_NOT_USE_OR_YOU_WILL_BE_FIRED = ReactDOM;
+
 module.exports = React;

vendor/react-dom.js

@@ -0,0 +1,31 @@
+// Based off https://github.com/ForbesLindesay/umd/blob/master/template.js
+;(function(f) {
+  // CommonJS
+  if (typeof exports === "object" && typeof module !== "undefined") {
+    module.exports = f(require('react'));
+
+  // RequireJS
+  } else if (typeof define === "function" && define.amd) {
+    define(['react'], f);
+
+  // <script>
+  } else {
+    var g
+    if (typeof window !== "undefined") {
+      g = window;
+    } else if (typeof global !== "undefined") {
+      g = global;
+    } else if (typeof self !== "undefined") {
+      g = self;
+    } else {
+      // works providing we're not in "use strict";
+      // needed for Java 8 Nashorn
+      // see https://github.com/facebook/react/issues/3037
+      g = this;
+    }
+    g.ReactDOM = f(g.React);
+  }
+
+})(function(React) {
+  return React.__SECRET_DOM_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+});