react-google-recaptcha "ref" type error in React typescript

Question

I'm trying to implement invisible reCaptcha from react-google-recaptcha in type script project

I added the package's type by

yarn add @types/react-google-recaptcha

but when I want to implement the component, I get a type script error in here

  <ReCAPTCHA
        ref={recaptchaRef} // IN HERE
        size="invisible"
        sitekey="Your client site key"
      />

and this is the error's content

 Type 'MutableRefObject<undefined>' is not assignable to type 'LegacyRef<ReCAPTCHA> | undefined'.''
 Type 'MutableRefObject<undefined>' is not assignable to type 'RefObject<ReCAPTCHA>'.
 Types of property 'current' are incompatible.

Answer 1

Just give it an initial value of null. It takes undefined as initial value in your current implementation.

const recaptchaRef = useRef(null)
// or
const recaptchaRef = useRef<ReCAPTCHA>(null);

// ....

<ReCAPTCHA
  ref={recaptchaRef}
  size="invisible"
  sitekey="Your client site key"
/>

---

Explanation:

By looking at types, ref attribute expects a type as below:

(JSX attribute) React.ClassAttributes<ReCAPTCHA>.ref?: string | ((instance: ReCAPTCHA | null) => void) | React.RefObject<ReCAPTCHA> | null | undefined

i.e.

string | ((instance: ReCAPTCHA | null) => void) | React.RefObject<ReCAPTCHA> | null | undefined

where RefObject is:

interface RefObject<T> {
  readonly current: T | null;
}

So, the value of current should be of some type or null.