@itrigger/dagre-d3/lib/d3.js

A D3-based renderer for Dagre

// Stub to get D3 either via NPM or from the global object
var d3;

if (!d3) {
  if (typeof require === "function") {
    try {
      d3 = require("d3");
    }
    catch (e) {
      // continue regardless of error
    }
  }
}

if (!d3) {
  d3 = window.d3;
}

module.exports = d3;