idea for controller api

example.js

var keyboard = require('controller-keyboard')

var gameState = {
  input: {}
}

keyboard.subscribe(function (action, active) {
  // active is the current inputs that are active
  // this is triggered every time the state of a key has changed
  // maybe we would do something like this to the game state:
  gameState.input['keyboard'] = active
  // except this part could be done with immutable, redux-like dispatches


  // action looks like this:
  
  {
    type: 'on' || 'off',
    value: 'value representing the input',
    event: // original event, browser keyboard event, for instance
  }
})

index.js

var vkey = require('vkey')

module.exports = function createKeyboardController (options) {
  var listener = function () {}
  var active = {}

  document.addactionListener('keydown', function (e) {
    var value = vkey[e.keyCode]
    active[value] = true

    var action = {
      type: 'on',
      value: value,
      event: e
    }

    listener(action, active)
  }, false)

  document.addactionListener('keyup', function (e) {
    var value = vkey[e.keyCode]
    delete active[value]

    var action = {
      type: 'off',
      value: value,
      event: e
    }

    listener(action, active)
  }, false)

  return {
    subscribe: function (cb) {
      listener = cb
    }
  }
}

I wonder if it would be easier to have action creators that do things like

move(state.position, action.keys)

And then dispatch the result. That way the reducer stays as simple as possible.