add customizer for merging arrays

lib/tasks/cognigy/speech-config.js

@@ -1,4 +1,6 @@
+const obj = require('drachtio-fsmrf/lib/utils');
 const Emitter = require('events');
+const { isArray } = require('lodash');
 const lodash = require('lodash');
 const hasKeys = (obj) => typeof obj === 'object' && Object.keys(obj) > 0;
 
@@ -18,11 +20,17 @@ class SpeechConfig extends Emitter {
 
   _mergeConfig(changedConfig = {}) {
     const merged = lodash.merge(
-      {},
       this.sessionConfig,
-      changedConfig
+      changedConfig,
+      (objValue, sourceValue) => {
+        if(isArray(objValue)){
+          if(isArray(sourceValue)){
+            return sourceValue;
+          }
+          return objValue;
+        }
+      }
     );
-    merged.bargein.enable = changedConfig.bargein?.enable?.length === 0 ? [] : changedConfig.bargein?.enable;
     this.logger.debug({merged, sessionConfig: this.sessionConfig, changedConfig}, 'merged config');
     // should we override hints with empty array or leave it as it is once saved?
     // merged.recognizer.hints = changedConfig.recognizer?.hints