title: d3 v4 Hierarchical Edge Bundling
body: <p>I am trying to move my Hierarchical Edge Bundling chart to d3v4.</p>
  
  <p>but could not find an alternative to d3.layout.bundle(). </p>
  
  <p>d3v3 example is <a href="https://bl.ocks.org/mbostock/7607999" rel="nofollow">https://bl.ocks.org/mbostock/7607999</a></p>
  
  <p>any example with d3v4? Please help.</p>