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

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

export interface DiamondNodeModelGenerics {
	PORT: DiamondPortModel;
}

export class DiamondNodeModel extends NodeModel<NodeModelGenerics & DiamondNodeModelGenerics> {
	constructor() {
		super({
			type: 'diamond'
		});
		this.addPort(new DiamondPortModel(PortModelAlignment.TOP));
		this.addPort(new DiamondPortModel(PortModelAlignment.LEFT));
		this.addPort(new DiamondPortModel(PortModelAlignment.BOTTOM));
		this.addPort(new DiamondPortModel(PortModelAlignment.RIGHT));
	}
}