React Js disable button according to input length

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
  </head>

<body>
    <div id="app"></div>
    <script type="text/babel">
      const { useState, useEffect } = React;

function App() {
        const [firstName, setFirstName] = useState("");
        const [lastName, setLastName] = useState("");
        const [isButtonDisabled, setIsButtonDisabled] = useState(true);

useEffect(() => {
          setIsButtonDisabled(firstName.length < 3 || lastName.length < 3);
        }, [firstName, lastName]);

const addNewCustomer = async (name, surname) => {
          //handle submit function as you want
          await service.addCustomer(name, surname);
          props.funcParam();
        };

return (
          <div className="container">
            <h3>React Js disable button according to input length</h3>
            <form>
              <input
                className="input-field"
                type="text"
                placeholder="First Name"
                value={firstName}
                onChange={(e) => setFirstName(e.target.value)}
              />
              <input
                className="input-field"
                type="text"
                placeholder="Last Name"
                value={lastName}
                onChange={(e) => setLastName(e.target.value)}
              />
              <button
                className="add-button"
                disabled={isButtonDisabled}
                onClick={() => addNewCustomer(firstName, lastName)}
              >
                Add
              </button>
            </form>
          </div>
        );
      }
      ReactDOM.render(<App />, document.getElementById("app"));
    </script>

.add-button {
        width: 100px;
        height: 30px;
        background-color: #4caf50;
        color: white;
        border: none;
        border-radius: 4px;
        cursor: pointer;
      }

.add-button:disabled {
        background-color: #ccc;
        cursor: not-allowed;
      }
    </style>
  </body>
</html>