Add a babel-preset-react module (#2770)

This simplifies dependency handling

js/babel-preset-noms/.gitignore

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+node_modules

js/babel-preset-noms/README.md

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+# babel-preset-noms
+
+Babel preset for Noms applications.
+
+## Install
+
+```sh
+$ npm install --save-dev babel-preset-noms
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "presets": ["noms"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel script.js --presets noms
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  presets: ["noms"]
+});
+```

js/babel-preset-noms/index.js

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+// Copyright 2016 Attic Labs, Inc. All rights reserved.
+// Licensed under the Apache License, version 2.0:
+// http://www.apache.org/licenses/LICENSE-2.0
+
+'use strict';
+
+function preset(n) {
+  return require('babel-preset-' + n);
+}
+
+function plugin(n) {
+  return require('babel-plugin-' + n);
+}
+
+const plugins = [
+  plugin('syntax-async-functions'),
+  plugin('transform-class-properties'),
+  plugin('transform-regenerator'),
+  [
+    plugin('transform-runtime'), {
+      polyfill: false,
+      regenerator: true,
+    },
+  ],
+];
+
+const production = {
+  presets: [
+    preset('es2015'),
+    preset('es2016'),
+    preset('react'),
+  ],
+  plugins
+};
+
+const development = {
+  presets: [
+    preset('es2016'),
+    preset('react'),
+  ],
+  plugins: [
+    plugin('transform-es2015-modules-commonjs'),
+    ...plugins,
+  ],
+};
+
+// Env handling is currently broken in Babel.
+// https://github.com/babel/babel/issues/4539
+
+const env = process.env.BABEL_ENV || process.env.NODE_ENV;
+module.exports = env === 'production' ? production : development;

js/babel-preset-noms/package.json

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+{
+  "name": "babel-preset-noms",
+  "version": "1.0.0",
+  "description": "Babel preset for all Noms code.",
+  "homepage": "https://babeljs.io/",
+  "license": "Apache-2.0",
+  "repository": "https://github.com/attic-labs/noms/tree/master/js/babel-preset-noms",
+  "engines": {
+    "node": ">= 6",
+  },
+  "dependencies": {
+    "babel-cli": "^6.14.0",
+    "babel-core": "^6.14.0",
+    "babel-generator": "^6.14.0",
+    "babel-plugin-syntax-async-functions": "^6.13.0",
+    "babel-plugin-transform-async-to-generator": "^6.8.0",
+    "babel-plugin-transform-class-properties": "^6.11.5",
+    "babel-plugin-transform-es2015-destructuring": "^6.9.0",
+    "babel-plugin-transform-es2015-modules-commonjs": "^6.14.0",
+    "babel-plugin-transform-es2015-parameters": "^6.11.4",
+    "babel-plugin-transform-runtime": "^6.15.0",
+    "babel-preset-es2015": "^6.14.0",
+    "babel-preset-es2016": "^6.16.0",
+    "babel-preset-react": "^6.11.1",
+    "babylon": "^6.11.1"
+  }
+}