Code

import * as Diagramming from '@mindfusion/diagramming';
import * as Drawing from '@mindfusion/drawing';

class CustomBehavior extends Diagramming.LinkNodesBehavior {

    createController(state) {

        var diagram = this.diagram;
        if (state.buttonDown) {
            var w = diagram.alignToGrid ? diagram.gridSizeX : 1;
            var h = diagram.alignToGrid ? diagram.gridSizeY : 1;

            var node = this.createCustomNode(state.buttonDown, diagram);
            var alignedPoint = diagram.alignResize(
                node, state.pointerPosition, Diagramming.AdjustmentHandles.ResizeTopLeft);
            node.bounds = new Drawing.Rect(alignedPoint.x, alignedPoint.y, w, h);

            var controller = new Diagramming.CreateNodeController(diagram, node);
            return controller;
        }
        return super.createController(state);
    }

    createCustomNode(state, diagram) {
        return (state == 1) ? new Diagramming.TableNode(diagram) : new Diagramming.TreeViewNode(diagram);
    }
}

var diagramView = Diagramming.DiagramView.create(<HTMLCanvasElement>document.getElementById("diagram"));
diagramView.currentBehavior = new CustomBehavior(diagramView, (diagramView) => { return new Diagramming.ShapeNode(diagramView.diagram); }, null);