react-diagrams/demos/demo-simple/index.tsx

import {
	DiagramEngine,
	DiagramModel,
	DefaultNodeModel,
	LinkModel,
	DiagramWidget,
	DefaultLinkModel
} from "storm-react-diagrams";
import * as React from "react";

export default () => {
	//1) setup the diagram engine
	var engine = new DiagramEngine();
	engine.installDefaultFactories();

	//2) setup the diagram model
	var model = new DiagramModel();

	//3-A) create a default node
	var node1 = new DefaultNodeModel("Node 1", "rgb(0,192,255)");
	let port1 = node1.addOutPort("Out");
	node1.setPosition(100, 100);

	//3-B) create another default node
	var node2 = new DefaultNodeModel("Node 2", "rgb(192,255,0)");
	let port2 = node2.addInPort("In");
	node2.setPosition(400, 100);

	// link the ports
	let link1 = port1.link(port2);
	(link1 as DefaultLinkModel).addLabel("Hello World!");

	//4) add the models to the root graph
	model.addAll(node1, node2, link1);

	//5) load model into engine
	engine.setDiagramModel(model);

	//6) render the diagram!
	return <DiagramWidget className="srd-demo-canvas" diagramEngine={engine} />;
};