Improvements to the packager for very large projects

Summary:
Here are some small fixes for issues we've encountered with very large RN projects (mostly huge dependency trees in `node_modules`).

cc amasad martinbigio
Closes https://github.com/facebook/react-native/pull/4880

Reviewed By: svcscm

Differential Revision: D2782834

Pulled By: mkonicek

fb-gh-sync-id: e316a62b84ba796b80ac819431414ebf27f7b566

local-cli/server/runServer.js

@@ -49,6 +49,10 @@ function runServer(args, config, readyCallback) {
       readyCallback();
     }
   );
+  // Disable any kind of automatic timeout behavior for incoming
+  // requests in case it takes the packager more than the default
+  // timeout of 120 seconds to respond to a request.
+  serverInstance.timeout = 0;
 }
 
 function getAppMiddleware(args, config) {

packager/react-packager/src/DependencyResolver/FileWatcher/index.js

@@ -13,7 +13,7 @@ const sane = require('sane');
 const Promise = require('promise');
 const exec = require('child_process').exec;
 
-const MAX_WAIT_TIME = 25000;
+const MAX_WAIT_TIME = 120000;
 
 // TODO(amasad): can we use watchman version command instead?
 const detectingWatcherClass = new Promise(function(resolve) {

packager/react-packager/src/DependencyResolver/fastfs.js

@@ -293,11 +293,11 @@ class File {
   }
 
   getFiles() {
-    const files = [];
+    let files = [];
     Object.keys(this.children).forEach(key => {
       const file = this.children[key];
       if (file.isDir) {
-        files.push(...file.getFiles());
+        files = files.concat(file.getFiles());
       } else {
         files.push(file);
       }