Moving the jest configuration from jest-react-native to react native.

Reviewed By: cpojer

Differential Revision: D3923609

fbshipit-source-id: 62804df81b064871b499ae8c091e13dd1e0f229b

jest/preprocessor.js

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+'use strict';
+
+const babel = require('babel-core');
+const babelRegisterOnly = require('../packager/babelRegisterOnly');
+const createCacheKeyFunction = require('fbjs-scripts/jest/createCacheKeyFunction');
+const path = require('path');
+const transformer = require('../packager/transformer.js');
+
+const nodeFiles = RegExp([
+  '/local-cli/',
+  '/packager/(?!react-packager/src/Resolver/polyfills/)',
+].join('|'));
+const nodeOptions = babelRegisterOnly.config([nodeFiles]);
+
+module.exports = {
+  process(src, file) {
+    // Don't transform node_modules, except react-tools which includes the
+    // untransformed copy of React
+    if (file.match(/node_modules\/(?!react-tools\/)/)) {
+      return src;
+    } else if (nodeFiles.test(file)) { // node specific transforms only
+      return babel.transform(
+        src, Object.assign({filename: file}, nodeOptions)).code;
+    }
+
+    return transformer.transform(src, file, {inlineRequires: true}).code;
+  },
+
+  getCacheKey: createCacheKeyFunction([
+    __filename,
+    path.join(__dirname, '../packager/transformer.js'),
+    require.resolve('babel-core/package.json'),
+  ]),
+};