for medium post

forceSimulation.js

export const forceSimulation = (d3, {width, height}) => d3.forceSimulation()
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2));


// use: 

const simulation = forceSimulation(d3, {width,height});

 simulation.force("link", 
  d3.forceLink()
  .id(function (d) {return d.id;})
  .distance(200)
  .strength(2));