From 049fd9a902da74ab0346a99efad8d41d75c5c24a Mon Sep 17 00:00:00 2001
From: Ben Alpert <balpert@fb.com>
Date: Thu, 28 May 2015 16:09:25 -0700
Subject: [PATCH] Retain lines in babel under jest

Now stack trace lines are actually useful.
---
 jest/preprocessor.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/jest/preprocessor.js b/jest/preprocessor.js
index d08031069e..484cd5c86a 100644
--- a/jest/preprocessor.js
+++ b/jest/preprocessor.js
@@ -23,7 +23,8 @@ module.exports = {
     if (!path.match(/\/node_modules\//) && !path.match(/\/third_party\//)) {
       return babel.transform(src, {
         blacklist: ['spec.functionName', 'validation.react'],
-        filename: path
+        filename: path,
+        retainLines: true
       }).code;
     }
     return src;