chain-able/dists/src/plugins/autoIncrement.js

interfaces that describe their intentions.

/**
 * @plugin
 * @param  {Primitive} name method name
 * @param  {Object} parent Parent
 * @return {MethodChain} @chainable
 */
module.exports = function(name, parent) {
  return this.initial(0).onCall(() => parent.tap(name, num => num + 1))
}