From f2de82a3684875e2d6bc085a45a2014106fe3e6a Mon Sep 17 00:00:00 2001
From: Brian Ng <bng412@gmail.com>
Date: Fri, 7 Apr 2017 14:39:12 -0500
Subject: [PATCH] Drop extends helper (#254)

---
 experimental/babel-preset-env/src/index.js |  4 ++--
 experimental/babel-preset-env/src/utils.js | 13 -------------
 2 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/experimental/babel-preset-env/src/index.js b/experimental/babel-preset-env/src/index.js
index 4cab510b09..100364b8a1 100644
--- a/experimental/babel-preset-env/src/index.js
+++ b/experimental/babel-preset-env/src/index.js
@@ -7,7 +7,7 @@ import pluginList from "../data/plugins.json";
 import useBuiltInsEntryPlugin from "./use-built-ins-entry-plugin";
 import addUsedBuiltInsPlugin from "./use-built-ins-plugin";
 import getTargets from "./targets-parser";
-import { _extends, prettifyTargets, prettifyVersion, semverify } from "./utils";
+import { prettifyTargets, prettifyVersion, semverify } from "./utils";
 
 /**
  * Determine if a transformation is required
@@ -79,7 +79,7 @@ const filterItem = (targets, exclusions, list, item) => {
 };
 
 const getBuiltInTargets = targets => {
-  const builtInTargets = _extends({}, targets);
+  const builtInTargets = Object.assign({}, targets);
   if (builtInTargets.uglify != null) {
     delete builtInTargets.uglify;
   }
diff --git a/experimental/babel-preset-env/src/utils.js b/experimental/babel-preset-env/src/utils.js
index d2ba002e11..54d37b8287 100644
--- a/experimental/babel-preset-env/src/utils.js
+++ b/experimental/babel-preset-env/src/utils.js
@@ -1,19 +1,6 @@
 // @flow
 import semver from "semver";
 
-export const _extends = Object.assign ||
-  function(target) {
-    for (let i = 1; i < arguments.length; i++) {
-      const source = arguments[i];
-      for (const key in source) {
-        if (Object.prototype.hasOwnProperty.call(source, key)) {
-          target[key] = source[key];
-        }
-      }
-    }
-    return target;
-  };
-
 // Convert version to a semver value.
 // 2.5 -> 2.5.0; 1 -> 1.0.0;
 export const semverify = version => {