iom v2.1.1

import Store from 'iom';

const INITIAL_STATE = { on: false };

const store = new Store(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();