la-rado v1.0.0-rc.15

const INITIAL_STATE = Object.freeze({ on: false });

const Store = new LaRado(INITIAL_STATE);

const subscriber = console.log;

const cancel = Store.subscribe(subscriber);
// => { on: false }

const toggleOn = state => ({ ...state, on: !state.on });

Store.update(toggleOn);
// => { on: true }

cancel();