From 06c448727b48848d07600df2967186157d1d2ce6 Mon Sep 17 00:00:00 2001
From: Jimmy Huang <victor0801x@gmail.com>
Date: Fri, 27 Jul 2018 14:44:03 +0800
Subject: [PATCH] fix: #743 cannot modify immutable configuration

---
 lib/log4js.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/log4js.js b/lib/log4js.js
index 072330d..69faa63 100644
--- a/lib/log4js.js
+++ b/lib/log4js.js
@@ -22,6 +22,7 @@
  */
 const debug = require('debug')('log4js:main');
 const fs = require('fs');
+const CircularJSON = require('circular-json');
 const configuration = require('./configuration');
 const layouts = require('./layouts');
 const levels = require('./levels');
@@ -57,7 +58,7 @@ function configure(configurationFileOrObject) {
     configObject = loadConfigurationFile(configurationFileOrObject);
   }
   debug(`Configuration is ${configObject}`);
-  configuration.configure(configObject);
+  configuration.configure(CircularJSON.parse(CircularJSON.stringify(configObject)));
 
   clustering.onMessage(sendLogEventToAppender);