import React, { Component } from 'react'; import PropTypes from 'prop-types'; class Counter extends Component { render() { const { increment, autoIncrement, incrementAsync, decrement, counter } = this.props; return ( <p> Clicked: {counter} times <button onClick={increment}>+</button>{' '} <button onClick={decrement}>-</button>{' '} <button onClick={incrementAsync}>Increment async</button>{' '} <button onClick={autoIncrement}>Auto increment</button> </p> ); } } Counter.propTypes = { increment: PropTypes.func.isRequired, autoIncrement: PropTypes.func.isRequired, incrementAsync: PropTypes.func.isRequired, decrement: PropTypes.func.isRequired, counter: PropTypes.number.isRequired, }; export default Counter;