Empty interface example - refactoring blog post

chart.js

var chartManager = {}
chartManager.line = function(selector) {
  var config = {
    height: 200,
    width: 200
  }
  
  var dataCache = []
  var events = function(eventName, cb) {
    
  }
  
  function render() {
  
  }
  
  function setConfig(newConfig) {
    Object.assign(config, newConfig)
  }
  
  function setData(data) {
    dataCache = data
    render()
  }
  
  return {
    config: setConfig,
    on: events,
    data: setData,
    render: render
  }
}