From f0049726253178d7d97c6790f03b35628eee86f4 Mon Sep 17 00:00:00 2001
From: Guy Bedford <guybedford@gmail.com>
Date: Tue, 27 Feb 2018 16:46:24 +0200
Subject: [PATCH] Ensure babel-preset-env targets input object is not mutated
 (#7438)

---
 packages/babel-preset-env/src/normalize-options.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/babel-preset-env/src/normalize-options.js b/packages/babel-preset-env/src/normalize-options.js
index 9c0b2ed139..bbcdbd19f7 100644
--- a/packages/babel-preset-env/src/normalize-options.js
+++ b/packages/babel-preset-env/src/normalize-options.js
@@ -169,7 +169,7 @@ export default function normalizeOptions(opts: Options) {
       false,
     ),
     spec: validateBoolOption("loose", opts.spec, false),
-    targets: opts.targets,
+    targets: Object.assign({}, opts.targets),
     useBuiltIns: validateUseBuiltInsOption(opts.useBuiltIns),
   };
 }