From 3a8ce1f68f6d54c82f14df2dcbb530c24c32af0b Mon Sep 17 00:00:00 2001
From: Steven Hargrove <steven.hargrove@gmail.com>
Date: Fri, 7 Jul 2017 22:29:07 -0400
Subject: [PATCH] fixed breaking change for MultiCompiler support

---
 src/index.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index 1730f2b9..e36981ce 100644
--- a/src/index.js
+++ b/src/index.js
@@ -149,7 +149,10 @@ class UglifyJsPlugin {
   }
 
   apply(compiler) {
-    const requestShortener = new RequestShortener(compiler.context);
+    if (UglifyJsPlugin.appliedCompilers.has(compiler)) return;
+    UglifyJsPlugin.appliedCompilers.add(compiler);
+
+    const requestShortener = new RequestShortener(compiler.context || process.cwd());
     // Copy uglify options
     const uglifyOptions = UglifyJsPlugin.buildDefaultUglifyOptions(this.uglifyOptions);
     // Making sure output options exists if there is an extractComments options
@@ -280,4 +283,11 @@ class UglifyJsPlugin {
   }
 }
 
+Object.defineProperty(UglifyJsPlugin, 'appliedCompilers', {
+  enumerable: false,
+  configurable: false,
+  writable: false,
+  value: new WeakSet(),
+});
+
 export default UglifyJsPlugin;