Fix warnings.

src/components/LanguagePicker.tsx

@@ -1,9 +1,9 @@
-import { useRecoilState } from 'recoil';
+import { useSetRecoilState } from 'recoil';
 import { currentLanguage } from '../atoms/language';
 import './LanguagePicker.scss';
 
 export const LanguagePicker = () => {
-  const [lang, setLang] = useRecoilState(currentLanguage);
+  const setLang = useSetRecoilState(currentLanguage);
 
   return (
     <h1 className='LanguagePicker'>

src/components/Program.tsx

@@ -1,5 +1,4 @@
 import { FormattedMessage } from 'react-intl';
-import { Link } from 'react-router-dom';
 import './Program.scss';
 
 export const Program = () => {

src/components/RegForm.tsx

@@ -69,6 +69,8 @@ const RegForm = ({ history }: any) => {
         welcomeDrink: visitor.welcomeDrink ?? '',
         invitationId: (visitor.invitationId = decodedInvitationId),
       }).then((res) => (responseCode = res));
+
+      return visitor;
     });
 
     submitInvitation(decodedInvitationId).then((res) => (responseCode = res));
@@ -225,7 +227,7 @@ const RegForm = ({ history }: any) => {
             </>
           )}
         </Form.List>
-        {visitorCount == 0 ? (
+        {visitorCount === 0 ? (
           <Form.Item>
             <Button
               className='submitButton'