From 9f5a86bc7d0afe8d5395e2e87b4b006ac1c8fae4 Mon Sep 17 00:00:00 2001
From: Alexander Reece <github@reece45.com>
Date: Tue, 9 Oct 2018 15:29:14 -0400
Subject: [PATCH] Create an options object for each plugin instance

---
 lib/index.js                | 11 +++++++----
 src/webpack-shell-plugin.js | 13 ++++++++-----
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/lib/index.js b/lib/index.js
index d6c468e..e93f3f2 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -220,13 +220,16 @@ var WebpackShellPlugin = function () {
     }
   }, {
     key: 'mergeOptions',
-    value: function mergeOptions(options, defaults) {
+    value: function mergeOptions(provided, defaults) {
+      var options = {};
       for (var key in defaults) {
-        if (options.hasOwnProperty(key)) {
-          defaults[key] = options[key];
+        if (provided.hasOwnProperty(key)) {
+          options[key] = provided[key];
+        } else {
+          options[key] = defaults[key];
         }
       }
-      return defaults;
+      return options;
     }
   }, {
     key: 'apply',
diff --git a/src/webpack-shell-plugin.js b/src/webpack-shell-plugin.js
index b287508..765cf97 100644
--- a/src/webpack-shell-plugin.js
+++ b/src/webpack-shell-plugin.js
@@ -59,13 +59,16 @@ export default class WebpackShellPlugin {
     return options;
   }
 
-  mergeOptions(options, defaults) {
-    for (const key in defaults) {
-      if (options.hasOwnProperty(key)) {
-        defaults[key] = options[key];
+  mergeOptions(provided, defaults) {
+    const options = {};
+    for (var key in defaults) {
+      if (provided.hasOwnProperty(key)) {
+        options[key] = provided[key];
+      } else {
+        options[key] = defaults[key];
       }
     }
-    return defaults;
+    return options;
   }
 
   apply(compiler) {