Add flow types for output modules

Summary: Adds flow types for output functionality for easier maintenance and interop with new code

Reviewed By: matryoshcow

Differential Revision: D4211863

fbshipit-source-id: 591407d3a6d49536054ae94ba31125c18a1e1fa1

local-cli/bundle/output/unbundle/index.js

@@ -5,13 +5,19 @@
  * 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.
+ *
+ * @flow
  */
 'use strict';
 
 const asAssets = require('./as-assets');
 const asIndexedFile = require('./as-indexed-file');
 
-function buildBundle(packagerClient, requestOptions) {
+import type Bundle from '../../../../packager/react-packager/src/Bundler/Bundle';
+import type Server from '../../../../packager/react-packager/src/Server';
+import type {OutputOptions, RequestOptions} from '../../types.flow';
+
+function buildBundle(packagerClient: Server, requestOptions: RequestOptions) {
   return packagerClient.buildBundle({
     ...requestOptions,
     unbundle: true,
@@ -19,7 +25,11 @@ function buildBundle(packagerClient, requestOptions) {
   });
 }
 
-function saveUnbundle(bundle, options, log) {
+function saveUnbundle(
+  bundle: Bundle,
+  options: OutputOptions,
+  log: (x: string) => void,
+): Promise<mixed> {
   // we fork here depending on the platform:
   // while android is pretty good at loading individual assets, ios has a large
   // overhead when reading hundreds pf assets from disk