compatibilidad con CommonJS

test.js

class GT {

  constructor () {
    this.state = {}
    this.actions = {}
    this.stateListeners = {}
  }

  get register () {
    return {
      state: (name, data) => {
        this.state[name] = data
        this.stateListeners[name] = []
        this.actions[name] = {}
        return this
      },

      modules: (modules) => {
        modules.forEach((module) => {
          this.register.state(module.name, module.states)
          Object.keys(module.actions).forEach((name) => {
            module.actions.gt = this
            this.actions[module.name][name] = (data) => module.actions[name](data, this)
          })
        })
        return this
      },

      states: (states) => {
        Object.keys(states).forEach((name) => this.create.state(name, states[name]))
        return this
      }
    }
  }

  subscribe (name, callback) {
    this.stateListeners[name].push(callback)
    return this
  }

  dispatchStateListeners (name, data) {
    this.stateListeners[name].forEach((listener) => listener(data))
    return this
  }

  setState (name, data) {
    Object.keys(data).forEach((key) => {
      this.state[name][key] = data[key]
    })
    this.dispatchStateListeners(name, this.state[name])
    return this
  }

  removeState (name, property) {
    if (property) {
      delete this.state[name][property]
    } else {
      delete this.state[name]
    }
    return this
  }

  states (name, property) {
    if (property) {
      return this.state[name][property]
    } else {
      return this.state[name]
    }
  }

  actions (state, action) {
    if (action) {
      return this.actions[state][action]
    } else {
      return this.actions[state]
    }
  }
}