vdom-main.js

function main(initialState, render) {
  ...

  return {
    update: function (currentState) {},
    elem: ...
  }
}

var state = ObservHash({ 
  ...
})

function render(state) {
  return h("div", [ ... ])
}

var loop = main(state(), render)
state(loop.update)

document.body.appendChild(loop.elem)