How to solve the problem of "isInitialized" in react js

This is an error in the App.js file present in the src of the main project file

This is the code snippet:

  15 | const [firebaseInitialized, setFirebaseInitialized] = useState(false);
  16 | 
  17 | useEffect(() => {
> 18 |   firebase.isInitialized().then(val => {
     | ^  19 |     setFirebaseInitialized(val);
  20 |   })
  21 |

Error in the following code is:

TypeError: Cannot read property 'isInitialized' of undefined

What shall I do to solve this error?