fix: set initial state for follow

velog devs wants to sleep

Author: velopert

src/components/common/FollowButton.tsx

@@ -25,8 +25,12 @@ const FollowButton: React.FC<PostFollowButtonProps> = ({
   const [unfollow, { loading: loadingUnfollowUser }] =
     useMutation(UNFOLLOW_USER);
 
-  const [initialFollowState, setInitialFollowState] = React.useState<boolean>();
-  const [currentFollowState, setCurrentFollowState] = React.useState<boolean>();
+  const [initialFollowState, setInitialFollowState] = React.useState<boolean>(
+    !!followed,
+  );
+  const [currentFollowState, setCurrentFollowState] = React.useState<boolean>(
+    !!followed,
+  );
 
   const [buttonText, setButtonText] = React.useState('팔로잉');
 
@@ -97,6 +101,8 @@ const FollowButton: React.FC<PostFollowButtonProps> = ({
     setCurrentFollowState(followed);
   }, [followed]);
 
+  if (followed === undefined) return null;
+
   return (
     <FollowButtonBlock
       data-testid="follow-btn"