graphviz-layout.js

const graphviz = require("graphviz");

const defaultOptions = {
  G: {
    overlap: false,
    pad: 0.3,
    rankdir: "LR",
    layout: "dot",
    bgcolor: "#111111",
  },
  E: {
    color: "#757575",
  },
  N: {
    fontname: "Arial",
    fontsize: "14px",
    color: "#c6c5fe",
    shape: "box",
    style: "rounded",
    height: 0,
    fontcolor: "#c6c5fe",
  },
  type: "dot",
};

function createGraph(graph, options) {
  const g = graphviz.digraph("G");
  const nodes = {};

  Object.keys(graph).forEach((id) => {
    nodes[id] = nodes[id] || g.addNode(id);

    graph[id].forEach((depId) => {
      nodes[depId] = nodes[depId] || g.addNode(depId);

      g.addEdge(nodes[id], nodes[depId]);
    });
  });

  return new Promise((resolve, reject) => g.output(options, resolve, (code, out, err) => (err ? reject(err) : resolve(code))));
}

const graph = {
  a: ["b", "c"],
  b: ["c"],
  c: [],
	d: ["a", "b", "c"],
};

createGraph(graph, defaultOptions).then((code) => console.log(code.toString()));