d3-transfrom-suggestion.md

Instead of adding methods to d3.selection, make a transform its own object that you can define independently of a selection. So this...

d3.selectAll("g.label")
  .translate(function(d) { return [20,d.x*10]})
  .rotate(40)
  .scale(function(d) {return [d.size,2]})

... would turn into this:

var t = d3.transform()
    .translate(function(d) { return [20, d.x * 10]; })
    .rotate(40)
    .scale(function(d) { return [d.size, 2]; });

d3.select('g.label')
  .attr('transform', t);