gistfile1.js

class MyActions {
  asyncAction() {
    setTimeout(() => {
      this.dispatch('foo')
    })
  }
}

var myActions = alt.createActions(MyActions)

class MyStore {
  constructor() {
    this.bindActions(myActions)
    this.foo = null
  }
  
  onAsyncAction(foo) {
    setTimeout(() => {
      this.foo = foo
      this.emitChange()
    })
    return false
  }
}