Fix

dist/ngx-flowchart/bundles/ngx-flowchart.umd.js

@@ -575,9 +575,11 @@
              */
             function () { }));
             this.createEdge = createEdge || ((/**
+             * @param {?} event
+             * @param {?} edge
              * @return {?}
              */
-            function () { return rxjs.of({ label: 'label' }); }));
+            function (event, edge) { return rxjs.of(__assign({}, edge, { label: 'label' })); }));
             this.edgeAddedCallback = edgeAddedCallback || ((/**
              * @return {?}
              */

dist/ngx-flowchart/fesm2015/ngx-flowchart.js

@@ -367,9 +367,11 @@ class FcModelService {
          */
         () => { }));
         this.createEdge = createEdge || ((/**
+         * @param {?} event
+         * @param {?} edge
          * @return {?}
          */
-        () => of({ label: 'label' })));
+        (event, edge) => of(Object.assign({}, edge, { label: 'label' }))));
         this.edgeAddedCallback = edgeAddedCallback || ((/**
          * @return {?}
          */

dist/ngx-flowchart/fesm5/ngx-flowchart.js

@@ -1,4 +1,4 @@
-import { __extends, __values } from 'tslib';
+import { __extends, __values, __assign } from 'tslib';
 import { InjectionToken, Injectable, Component, ChangeDetectionStrategy, ElementRef, IterableDiffers, ChangeDetectorRef, NgZone, HostBinding, Input, HostListener, Directive, Inject, ComponentFactoryResolver, ViewChild, ViewContainerRef, NgModule } from '@angular/core';
 import { of } from 'rxjs';
 import { CommonModule } from '@angular/common';
@@ -377,9 +377,11 @@ var FcModelService = /** @class */ (function () {
          */
         function () { }));
         this.createEdge = createEdge || ((/**
+         * @param {?} event
+         * @param {?} edge
          * @return {?}
          */
-        function () { return of({ label: 'label' }); }));
+        function (event, edge) { return of(__assign({}, edge, { label: 'label' })); }));
         this.edgeAddedCallback = edgeAddedCallback || ((/**
          * @return {?}
          */

projects/ngx-flowchart/src/lib/model.service.ts

@@ -49,7 +49,7 @@ export class FcModelService {
     this.selectedObjects = selectedObjects;
 
     this.dropNode = dropNode || (() => {});
-    this.createEdge = createEdge || (() => of({label: 'label'}));
+    this.createEdge = createEdge || ((event, edge) => of({...edge, label: 'label'}));
     this.edgeAddedCallback = edgeAddedCallback || (() => {});
     this.nodeRemovedCallback = nodeRemovedCallback || (() => {});
     this.edgeRemovedCallback = edgeRemovedCallback || (() => {});