function easeInQuad(x) {

  return x * x;

}

//...

​

import Switch from 'react-js-switch';

​

export default function App() {

  const [isSwitchOn, setIsSwitchOn] = useState(true);

​

  const switch_onChange_handle = () => {

    setIsSwitchOn(!isSwitchOn);

    //...

  };

​

  return (

    <div>

      //...

      <Switch value={isSwitchOn} onChange={switch_onChange_handle} />

      //...

    </div>

  );

}