From 14bfc018bc22cfbc45123676b1733619a55b1917 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 4 May 2018 15:40:54 -0400
Subject: [PATCH] fix: avoid mutating original rules array close #1286

---
 lib/plugin.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/plugin.js b/lib/plugin.js
index c03119677..90fdb8045 100644
--- a/lib/plugin.js
+++ b/lib/plugin.js
@@ -26,7 +26,7 @@ class VueLoaderPlugin {
     }
 
     // get a hold of the raw rules
-    const rawRules = compiler.options.module.rules
+    const rawRules = compiler.options.module.rules.slice()
     // use webpack's RuleSet utility to normalize user rules
     const rawNormalizedRules = new RuleSet(rawRules).rules
 
@@ -127,6 +127,9 @@ class VueLoaderPlugin {
         return parsed.vue != null
       }
     })
+
+    // replace original rules
+    compiler.options.module.rules = rawRules
   }
 }