From eafac886fabcf1c65e380db61d1530ea2d019748 Mon Sep 17 00:00:00 2001
From: Adam Wathan <adam.wathan@gmail.com>
Date: Tue, 24 Oct 2017 12:13:05 -0400
Subject: [PATCH] Use lodash to extract keys safely

---
 src/lib/substituteResponsiveAtRules.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/lib/substituteResponsiveAtRules.js b/src/lib/substituteResponsiveAtRules.js
index dd8689623..837035edf 100644
--- a/src/lib/substituteResponsiveAtRules.js
+++ b/src/lib/substituteResponsiveAtRules.js
@@ -3,7 +3,7 @@ import postcss from 'postcss'
 import cloneNodes from '../util/cloneNodes'
 import buildMediaQuery from '../util/buildMediaQuery'
 
-export default function(options) {
+export default function({ screens }) {
   return function(css) {
     const rules = []
 
@@ -14,10 +14,10 @@ export default function(options) {
       atRule.remove()
     })
 
-    Object.keys(options.screens).forEach(screen => {
+    _.keys(screens).forEach(screen => {
       const mediaQuery = postcss.atRule({
         name: 'media',
-        params: buildMediaQuery(options.screens[screen]),
+        params: buildMediaQuery(screens[screen]),
       })
 
       mediaQuery.append(