You also need to re-bind it to d3.

  $ = d3.selectAll.bind(d3);

Since `this` in the `selectAll` will refer to whatever is before the period. When we reassign to `$` in `$ = d3.selectAll`, we lose that. Silly, isn't it?

Demo: http://jsbin.com/guyisewexu/1/edit?js,console