Counter.js

export default ({ counter = {} }) => (
  <div>
    <h1>
      Count: <span>{counter.count}</span>
    </h1>
    <button onClick={() => counter.decrement()}>-1</button>
    <button onClick={() => counter.increment()}>+1</button>
    <button onClick={() => counter.reset()}>Reset</button>
  </div>
)