redux-devtools/extension/examples/counter/components/Counter.js

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;