Fix linter errors

guest-list-mobile/app/guests/[id].tsx

@@ -35,14 +35,18 @@ export default function Guests() {
 
   useEffect(() => {
     async function loadGuest() {
-      if (typeof id !== 'string') {
-        return;
+      try {
+        if (typeof id !== 'string') {
+          return;
+        }
+        const response = await fetch(`${API_URL}/guests/${id}`);
+        const fetchedGuest = await response.json();
+        setGuest(fetchedGuest);
+      } catch (error) {
+        console.error('Error fetching guest', error);
       }
-      const response = await fetch(`${API_URL}/guests/${id}`);
-      const fetchedGuest = await response.json();
-      setGuest(fetchedGuest);
     }
-    loadGuest();
+    loadGuest().catch(console.error);
   }, [id]);
 
   if (!guest) {

guest-list-mobile/app/hello+api.ts

@@ -1,5 +1,5 @@
-import { ExpoRequest, ExpoResponse } from 'expo-router/server';
+import { ExpoResponse } from 'expo-router/server';
 
-export function GET(request: ExpoRequest) {
+export function GET() {
   return ExpoResponse.json({ hello: 'world' });
 }

guest-list-mobile/app/index.tsx

@@ -68,16 +68,19 @@ export default function Index() {
         headers: {
           'Content-Type': 'application/json',
         },
-        body: JSON.stringify({ firstName, lastName }),
+        body: JSON.stringify({
+          firstName: guest.firstName,
+          lastName: guest.lastName,
+        }),
       });
       const newGuest: Guest = await response.json();
-      setGuests([...guests, newGuest]);
+      setGuests((g) => [...g, newGuest]);
     }
-    loadGuests();
-    callApi();
+    loadGuests().catch(console.error);
+    callApi().catch(console.error);
 
     if (typeof firstName === 'string' && typeof lastName === 'string') {
-      postGuest({ firstName, lastName });
+      postGuest({ firstName, lastName }).catch(console.error);
     }
   }, [firstName, lastName]);
   return (

guest-list-mobile/app/new-guest.tsx

@@ -30,19 +30,19 @@ const styles = StyleSheet.create({
 });
 
 export default function NewGuest() {
-  const [firstName, onFirstName] = useState('');
-  const [lastName, onLastName] = useState('');
+  const [firstName, setFirstName] = useState<string>('');
+  const [lastName, setLastName] = useState<string>('');
   return (
     <>
       <TextInput
         style={styles.input}
-        onChangeText={onFirstName}
+        onChangeText={setFirstName}
         placeholder="First Name"
         value={firstName}
       />
       <TextInput
         style={styles.input}
-        onChangeText={onLastName}
+        onChangeText={setLastName}
         placeholder="Last Name"
         value={lastName}
       />