Support relative paths in haste map

Summary: Since all paths are relative when building with the new Buck integration, `HasteMap` needed support for these.

Reviewed By: cpojer

Differential Revision: D4265888

fbshipit-source-id: 2d454bfd3866028d8d2c268c0fd318b148951dc9

Author: davidaurelio

packager/react-packager/src/node-haste/DependencyGraph/HasteMap.js

@@ -20,6 +20,7 @@ const PACKAGE_JSON = path.sep + 'package.json';
 
 class HasteMap extends EventEmitter {
   constructor({
+    allowRelativePaths,
     extensions,
     files,
     moduleCache,
@@ -28,6 +29,7 @@ class HasteMap extends EventEmitter {
     platforms,
   }) {
     super();
+    this._allowRelativePaths = allowRelativePaths;
     this._extensions = extensions;
     this._files = files;
     this._helpers = helpers;
@@ -126,7 +128,9 @@ class HasteMap extends EventEmitter {
   }
 
   _processHastePackage(file, previousName) {
-    file = path.resolve(file);
+    if (!this._allowRelativePaths) {
+      file = path.resolve(file);
+    }
     const p = this._moduleCache.getPackage(file);
     return p.isHaste()
       .then(isHaste => isHaste && p.getName()