import { State } from '@trinitymirrordigital/state-manager';


// Basic set up - pass keys you want to track.
const state = StateManager(['foo']); // will track changes to foo
// or you can pre-assign values
const state = StateManager(['foo'], {foo: 'bar'}); // will track changes to foo

// Add observer which will be called when there is a change to foo
state.addObserver = (state, oldState)=>{
  // do something with change
}

// basic usage
state.foo = 'something'; // add observer called 
// observer called with state {foo: 'something'} and oldState {foo: 'bar'}

state.foo = 'something'; // observer not called

// mass assign
state.massAssign = { foo: 'something else'}
// observer called with state {foo: 'something else'} and oldState {foo: 'something'}

// Get state
state.getState // return { foo: 'something else'}