From 696b8d4b3c26fc2f2995a90cc93e4e4cc86f9efc Mon Sep 17 00:00:00 2001
From: Ben Newman <ben@meteor.com>
Date: Thu, 9 Feb 2017 10:20:28 -0500
Subject: [PATCH] Fix Buffer conversion logic in writeFile.

---
 tools/isobuild/bundler.js | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/isobuild/bundler.js b/tools/isobuild/bundler.js
index 405e6b8c4c..722d5073a6 100644
--- a/tools/isobuild/bundler.js
+++ b/tools/isobuild/bundler.js
@@ -2419,10 +2419,11 @@ var writeFile = Profile("bundler writeFile", function (file, builder, options) {
   const hash = file.hash();
 
   if (options && options.sourceMapUrl) {
-    data = new Buffer(
-      addSourceMappingURL(data, options.sourceMapUrl),
-      "utf8"
-    );
+    data = addSourceMappingURL(data, options.sourceMapUrl);
+  }
+
+  if (! Buffer.isBuffer(data)) {
+    data = new Buffer(data, "utf8");
   }
 
   builder.write(file.targetPath, { data, hash });