<div id='app'></div>

const App = ({}) => {
  const inputRef = React.useRef(null);

  const showPassword = () => {
    inputRef.current.classList.add("green");
    const currentType = inputRef.current.type;
    inputRef.current.type = currentType === "text" ? "password" : "text";
  };
  return (
    <>
      <input ref={inputRef} type={"password"} />
      <button onClick={showPassword}>show password</button>
    </>
  );
};

ReactDOM.render(<App />, document.getElementById("app"));