From 32f694a707bd14c66e9d7297b006494ee5bd20b6 Mon Sep 17 00:00:00 2001
From: xzyfer <xzyfer@gmail.com>
Date: Wed, 15 Jun 2016 20:37:01 +1000
Subject: [PATCH] Prevent options leaking between compilations

Currently options are leaking between compilation runs. This is most
evident when using an array of importers. The array is shallow copied
internally, and the children of that array are wrapped by Node Sass.

When the next file is compiled the options are shallow copied once
again however this time the importer array contains the wrapped
importers not the original ones.

Instead of shallow copying with `Object.assign` this patch does a
full deep clone. Node Sass should also do this to prevent mutating
the options being passed in.

Related sass/node-sass#1168
Fixes #467 (probably)
---
 index.js     | 4 ++--
 package.json | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/index.js b/index.js
index a4ffdaac..5abdb67e 100644
--- a/index.js
+++ b/index.js
@@ -2,7 +2,7 @@
 
 var gutil = require('gulp-util');
 var through = require('through2');
-var assign = require('object-assign');
+var clonedeep = require('lodash.clonedeep');
 var path = require('path');
 var applySourceMap = require('vinyl-sourcemaps-apply');
 
@@ -34,7 +34,7 @@ var gulpSass = function gulpSass(options, sync) {
     }
 
 
-    opts = assign({}, options);
+    opts = clonedeep(options);
     opts.data = file.contents.toString();
 
     // we set the file path here so that libsass can correctly resolve import paths
diff --git a/package.json b/package.json
index 1ae912e2..ee07c5cf 100644
--- a/package.json
+++ b/package.json
@@ -22,8 +22,8 @@
   },
   "dependencies": {
     "gulp-util": "^3.0",
+    "lodash.clonedeep": "^4.3.2",
     "node-sass": "^3.4.2",
-    "object-assign": "^4.0.1",
     "through2": "^2.0.0",
     "vinyl-sourcemaps-apply": "^0.2.0"
   },