index.css

body {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans',
    'Droid Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New', monospace;
}

App.css

.red-box {
  background-color: red;
  width: 600px;
  height: 300px;
}

App.tsx

import React, { useRef, useState } from 'react';
import { ContextMenu } from 'typescript-react-test';
import './App.css';

function App() {
  const outerRef = useRef<HTMLDivElement>(null);
  const [option, setOption] = useState<string | undefined>('null');

  const menuOnClickHandler = (e: React.MouseEvent | React.KeyboardEvent<HTMLUListElement>) => {
    const eventTarget = e.target as HTMLUListElement;
    if (eventTarget) {
      setOption(() => eventTarget.dataset.option);
    }
  };

  return (
    <div className="App">
      <h2>holee-context-menu</h2>
      <p>⬇️ Click right mouse inside the red box ⬇️</p>

      <ContextMenu outerRef={outerRef} menuOnClick={(e) => menuOnClickHandler(e)}>
        <li data-option="profile">profile</li>
        <li data-option="send-message">send message</li>
        <li data-option="add-friend">add friend</li>
        <li data-option="play-game">play game</li>
        <li data-option="register-admin">register admin(dismissal)</li>
        <li data-option="block">block(unblock)</li>
        <li data-option="mute">mute(unmute)</li>
        <li data-option="forced-out">forced out</li>
      </ContextMenu>
      <div ref={outerRef} className="red-box"></div>

      <p>
        <strong>eventTarget.dataset.option: </strong> {option}
      </p>
    </div>
  );
}

export default App;

Uh oh!