the-forest/server/graphStuff.js

const { JSDOM } = require("jsdom");
const graphology = require("graphology");
const { circular } = require('graphology-layout');

function graphFromList(allTheStuff) {
	const graph = new graphology.Graph();
	for (const {number, html} of allTheStuff) {
		if (!graph.hasNode(number)) graph.addNode(number);
	}

	for (const {number, html} of allTheStuff) {
		const { document } = (new JSDOM(html)).window;
		const links = document.querySelectorAll('a');
		links.forEach((link) => {
			const referent = link.href.replace("/","");
			graph.mergeEdge(number, referent);
		});
	}

	circular.assign(graph);

	return graph;
}

module.exports = { graphFromList: graphFromList };