const options = {
  title: 'Title',
  message: 'Message',
  buttons: [
    {
      label: 'Yes',
      onClick: () => alert('Click Yes')
    },
    {
      label: 'No',
      onClick: () => alert('Click No')
    }
  ],
  closeOnEscape: true,
  closeOnClickOutside: true,
  keyCodeForClose: [8, 32],
  willUnmount: () => {},
  afterClose: () => {},
  onClickOutside: () => {},
  onKeypress: () => {},
  onKeypressEscape: () => {},
  overlayClassName: "overlay-custom-class-name"
};

confirmAlert(options);

import { confirmAlert } from 'react-confirm-alert'; // Import
import 'react-confirm-alert/src/react-confirm-alert.css'; // Import css

class App extends React.Component {
  submit = () => {
    confirmAlert({
      title: 'Confirm to submit',
      message: 'Are you sure to do this.',
      buttons: [
        {
          label: 'Yes',
          onClick: () => alert('Click Yes')
        },
        {
          label: 'No',
          onClick: () => alert('Click No')
        }
      ]
    });
  };

  render() {
    return (
      <div className='container'>
        <button onClick={this.submit}>Confirm dialog</button>
      </div>
    );
  }
}

confirmAlert({
  customUI: ({ onClose }) => {
    return (
      <div className='custom-ui'>
        <h1>Are you sure?</h1>
        <p>You want to delete this file?</p>
        <button onClick={onClose}>No</button>
        <button
          onClick={() => {
            this.handleClickDelete();
            onClose();
          }}
        >
          Yes, Delete it!
        </button>
      </div>
    );
  }
});