next.js/examples/with-electron/renderer/pages/index.js

import { useState, useEffect } from "react";

const Home = () => {
  const [input, setInput] = useState("");
  const [message, setMessage] = useState(null);

  useEffect(() => {
    const handleMessage = (event, message) => setMessage(message);
    window.electron.message.on(handleMessage);

    return () => {
      window.electron.message.off(handleMessage);
    };
  }, []);

  const handleSubmit = (event) => {
    event.preventDefault();
    window.electron.message.send(input);
    setMessage(null);
  };

  return (
    <div>
      <h1>Hello Electron!</h1>

      {message && <p>{message}</p>}

      <form onSubmit={handleSubmit}>
        <input
          type="text"
          value={input}
          onChange={(e) => setInput(e.target.value)}
        />
      </form>

      <style jsx>{`
        h1 {
          color: red;
          font-size: 50px;
        }
      `}</style>
    </div>
  );
};

export default Home;