react-diagrams/lib-demo-gallery/demos/demo-custom-node1/DiamondNodeModel.ts

import { NodeModel } from '@projectstorm/react-diagrams';
import { DiamondPortModel } from './DiamondPortModel';

export class DiamondNodeModel extends NodeModel {
	constructor() {
		super('diamond');
		this.addPort(new DiamondPortModel('top'));
		this.addPort(new DiamondPortModel('left'));
		this.addPort(new DiamondPortModel('bottom'));
		this.addPort(new DiamondPortModel('right'));
	}
}