From 4efe03f8ea34a55749e8369613313c54896ff18e Mon Sep 17 00:00:00 2001
From: Alec Jacob Deitloff <alec.deitloff@gmail.com>
Date: Thu, 4 Apr 2019 10:51:28 -0700
Subject: [PATCH] prevent setAssets from modifying original externals array

---
 lib/index.js | 2 +-
 src/index.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/index.js b/lib/index.js
index 432e68d1..21cb854f 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -327,7 +327,7 @@ var OfflinePlugin = (function () {
 
       var excludes = this.options.excludes;
       var assets = Object.keys(compilation.assets);
-      var externals = this.options.externals;
+      var externals = this.options.externals.slice();
 
       if (Array.isArray(excludes) && excludes.length) {
         assets = assets.filter(function (asset) {
diff --git a/src/index.js b/src/index.js
index 903bada2..1eba3591 100644
--- a/src/index.js
+++ b/src/index.js
@@ -339,7 +339,7 @@ export default class OfflinePlugin {
 
     const excludes = this.options.excludes;
     let assets = Object.keys(compilation.assets);
-    let externals = this.options.externals;
+    let externals = this.options.externals.slice();
 
     if (Array.isArray(excludes) && excludes.length) {
       assets = assets.filter((asset) => {