Add a deprecatedCallback helper

Reviewed By: svcscm

Differential Revision: D2926943

fb-gh-sync-id: 104bcd076f6427aac92e98081e492101ca78de26
shipit-source-id: 104bcd076f6427aac92e98081e492101ca78de26

Libraries/Utilities/deprecatedCallback.js

@@ -0,0 +1,48 @@
+/**
+ * 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.
+ *
+ * Helper for deprecated callback pattern
+ *
+ * @providesModule deprecatedCallback
+ * @flow
+ */
+
+'use strict';
+
+module.exports = function(promise: Promise, callbacks: Array<Function>, type: string, warning: string): Promise {
+  if (callbacks.length === 0) {
+    return promise;
+  }
+
+  let success, error;
+
+  console.warn(warning);
+
+  switch (type) {
+  case 'success-first': // handles func(success, error), func(success)
+    [ success, error ] = callbacks;
+    return promise.then(
+      res => success(res),
+      err => error && error(err)
+    );
+  case 'error-first': // handles func(error, success)
+    [ error, success ] = callbacks;
+    return promise.then(
+      res => success(res),
+      err => error(err)
+    );
+  case 'node': // handles func(callback)
+    const [ callback ] = callbacks;
+    return promise.then(
+      res => callback(null, res),
+      err => callback(err)
+    );
+  default:
+    throw new Error(`Type of callbacks not specified. Must be one of 'success-first', 'error-first', or 'node'`);
+  }
+};