GC-framework-update-suggestions

>main.js //to be invoked onLoad()
const store_ = new Store();
...

>store.js
constructor(){
 this.state_ = {};
 this.stateSubscriber_ = [];
}

set state(key, value){
//change state by key
  this.state[key] = value;
// invoke onStateChange
for each(sub in this.stateSubscriber_)
   sub.onStateChange_(key);
}

>indexPage.js
onStateChange_(udatedStateKey){
//update UI based on changes state
}