From 268a1f80a0dbbf63b27bc8d9760ed7d25a6dc54e Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Fri, 30 Oct 2015 04:38:27 +0000
Subject: [PATCH] only ignore cloning of plugins

---
 .../src/transformation/file/options/option-manager.js       | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/babel-core/src/transformation/file/options/option-manager.js b/packages/babel-core/src/transformation/file/options/option-manager.js
index cdb577ac5d..cb2d3105f5 100644
--- a/packages/babel-core/src/transformation/file/options/option-manager.js
+++ b/packages/babel-core/src/transformation/file/options/option-manager.js
@@ -162,7 +162,11 @@ export default class OptionManager {
     }
 
     //
-    let opts = cloneDeep(rawOpts, val => val);
+    let opts = cloneDeep(rawOpts, val => {
+      if (val instanceof Plugin) {
+        return val;
+      }
+    });
 
     //
     dirname = dirname || process.cwd();