redux-devtools/packages/redux-devtools-ui/src/Notification/Notification.tsx

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import { MdClose } from 'react-icons/md';
import { MdWarning } from 'react-icons/md';
import { MdError } from 'react-icons/md';
import { MdCheckCircle } from 'react-icons/md';
import { Base16Theme } from 'base16';
import createStyledComponent from '../utils/createStyledComponent';
import styles from './styles';

const NotificationWrapper = createStyledComponent(styles);

export type Type = 'info' | 'success' | 'warning' | 'error';

export interface NotificationProps {
  children?: React.ReactNode;
  type: Type;
  onClose?: React.MouseEventHandler<HTMLButtonElement>;
  theme?: Base16Theme;
}

export default class Notification extends Component<NotificationProps> {
  shouldComponentUpdate(nextProps: NotificationProps) {
    return (
      nextProps.children !== this.props.children ||
      nextProps.type !== this.props.type
    );
  }

  getIcon = () => {
    switch (this.props.type) {
      case 'warning':
        return <MdWarning />;
      case 'error':
        return <MdError />;
      case 'success':
        return <MdCheckCircle />;
      default:
        return null;
    }
  };

  render() {
    return (
      <NotificationWrapper type={this.props.type} theme={this.props.theme}>
        {this.getIcon()}
        <span>{this.props.children}</span>
        {this.props.onClose && (
          <button onClick={this.props.onClose}>
            <MdClose />
          </button>
        )}
      </NotificationWrapper>
    );
  }

  static propTypes = {
    children: PropTypes.any.isRequired,
    type: PropTypes.oneOf(['info', 'success', 'warning', 'error']),
    onClose: PropTypes.func,
    theme: PropTypes.object,
  };

  static defaultProps = {
    type: 'info',
  };
}