Bootstrap-ish jQuery plugin structure in CoffeeScript

coolWidget.js.coffee

((context, $) ->
  # COOL WIDGET CLASS DEFINITION
  #===================================
  context = (element, options) ->
    @options = options
    @$element = $(element).on('change', 'input[type=checkbox]', $.proxy(@update, this))

  context:: =
    constructor: context
    update: ->
      @$element # do something cool

  # COOL WIDGET DEFINITION
  #===================================
  $.fn.coolWidget = (option) ->
    @each ->
      $this = $(this)
      data = $this.data('coolWidget')
      options = $.extend({}, $.fn.coolWidget.defaults, $this.data(), typeof option is 'object' and option)
      $this.data 'coolWidget', (data = new context(this, options)) unless data
      data[option]() if typeof option is 'string'

  $.fn.coolWidget.defaults =
    $target_element: true

) window.coolWidget = window.coolWidget or {}, jQuery