[fix] Custom deepCopy function instead of loadlash

Author: dee077

src/js/netjsongraph.core.js

@@ -1,5 +1,3 @@
-import {cloneDeep} from "lodash";
-
 import NetJSONGraphDefaultConfig from "./netjsongraph.config";
 import NetJSONGraphUpdate from "./netjsongraph.update";
 
@@ -12,7 +10,7 @@ class NetJSONGraph {
    */
   constructor(JSONParam) {
     this.utils = new NetJSONGraphUpdate();
-    this.config = cloneDeep(NetJSONGraphDefaultConfig);
+    this.config = this.utils.deepCopy(NetJSONGraphDefaultConfig);
     // deepMergeObj is overriding the crs from the NetJSONGraphDefaultConfig after deep copy.
     this.config.crs = NetJSONGraphDefaultConfig.crs;
     this.JSONParam = this.utils.isArray(JSONParam) ? JSONParam : [JSONParam];

src/js/netjsongraph.util.js

@@ -260,6 +260,21 @@ class NetJSONGraphUtil {
     return convertGeojson(geojson);
   }
 
+  deepCopy(obj) {
+    if (obj === null || typeof obj !== "object") {
+        return obj;
+    }
+    if (Array.isArray(obj)) {
+        return obj.map(item => this.deepCopy(item));
+    }
+    const result = {};
+    const keys = Object.keys(obj);
+    for (const key of keys) {
+        result[key] = this.deepCopy(obj[key]);
+    }
+    return result;
+  }
+
   /**
    * merge two object deeply
    *