From 031adabd1878f3bfbcf263200bf8eb517cbece01 Mon Sep 17 00:00:00 2001
From: Amjad Masad <amasad@fb.com>
Date: Thu, 26 Mar 2015 10:45:12 -0700
Subject: [PATCH] [react-packager] better error when main file not found

---
 .../haste/DependencyGraph/index.js              | 17 ++++++++++++++++-
 packager/react-packager/src/Server/index.js     |  4 ++--
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/packager/react-packager/src/DependencyResolver/haste/DependencyGraph/index.js b/packager/react-packager/src/DependencyResolver/haste/DependencyGraph/index.js
index adb012828..f517236d9 100644
--- a/packager/react-packager/src/DependencyResolver/haste/DependencyGraph/index.js
+++ b/packager/react-packager/src/DependencyResolver/haste/DependencyGraph/index.js
@@ -86,7 +86,11 @@ DependecyGraph.prototype.load = function() {
 DependecyGraph.prototype.getOrderedDependencies = function(entryPath) {
   var absolutePath = this._getAbsolutePath(entryPath);
   if (absolutePath == null) {
-    throw new Error('Cannot find entry file in any of the roots: ' + entryPath);
+    throw new NotFoundError(
+      'Cannot find entry file %s in any of the roots: %j',
+      entryPath,
+      this._roots
+    );
   }
 
   var module = this._graph[absolutePath];
@@ -664,4 +668,15 @@ function buildAssetMap(roots, exts) {
   return search();
 }
 
+function NotFoundError() {
+  Error.call(this);
+  Error.captureStackTrace(this, this.constructor);
+  var msg = util.format.apply(util, arguments);
+  this.message = msg;
+  this.type = this.name = 'NotFoundError';
+  this.status = 404;
+}
+
+NotFoundError.__proto__ = Error.prototype;
+
 module.exports = DependecyGraph;
diff --git a/packager/react-packager/src/Server/index.js b/packager/react-packager/src/Server/index.js
index f40ebeeaf..ad417de11 100644
--- a/packager/react-packager/src/Server/index.js
+++ b/packager/react-packager/src/Server/index.js
@@ -281,11 +281,11 @@ function getBoolOptionFromQuery(query, opt, defaultVal) {
 }
 
 function handleError(res, error) {
-  res.writeHead(500, {
+  res.writeHead(error.status || 500, {
     'Content-Type': 'application/json; charset=UTF-8',
   });
 
-  if (error.type === 'TransformError') {
+  if (error.type === 'TransformError' || error.type === 'NotFoundError') {
     res.end(JSON.stringify(error));
   } else {
     console.error(error.stack || error);