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on_client ->
  import ReactiveVar, append, text, elements from require 'lib.component'
  import div, form, span, h3, a, input, textarea, button from elements

  parent = div!
  todoItem = (desc, done) ->
    -- convert into reactive data sources
    desc, done = (ReactiveVar desc), ReactiveVar done
    with me = div style:
        margin: '8px'
        padding: '8px'
        background: '#eeeeee'
      \append h3 (desc\map text), style: 'margin: 0;'
      \append span done\map (done) -> text if done then 'done' else 'not done yet'
      \append input type: 'checkbox', checked: done, onchange: (e) => done\set e.target.checked
      \append a (text 'delete'), href: '#', onclick: (e) => parent\remove me

  parent\append todoItem 'write a Component System'
  parent\append todoItem 'eat Lasagna', true

  desc = ReactiveVar 'start'
  form = with form {
      action: ''
      style:
        margin: '2px'
      onsubmit: (e) =>
        e\preventDefault!
        parent\append todoItem desc\get!
        desc\set ''
    }
    \append input type: 'text', value: desc, onchange: (e) => desc\set e.target.value
    \append input type: 'submit', value: 'add'

  append parent
  append form