fix : 코드래빗 피드백 반영

Author: KongMezu

src/shared/api/instance.ts

@@ -88,7 +88,9 @@ apiWithToken.interceptors.response.use(
       } catch (err) {
         processQueue(err, null);
         clearTokens();
-        window.location.href = '/login';
+        if (typeof window !== 'undefined') {
+          window.location.href = '/login';
+        }
         return Promise.reject(err);
       } finally {
         isRefreshing = false;

src/shared/utils/token.ts

@@ -1,15 +1,21 @@
 const ACCESS_TOKEN_KEY = 'accessToken';
 const REFRESH_TOKEN_KEY = 'refreshToken';
+const isBrowser =
+  typeof window !== 'undefined' && typeof window.localStorage !== 'undefined';
 
-export const getAccessToken = () => localStorage.getItem(ACCESS_TOKEN_KEY);
-export const getRefreshToken = () => localStorage.getItem(REFRESH_TOKEN_KEY);
+export const getAccessToken = () =>
+  isBrowser ? localStorage.getItem(ACCESS_TOKEN_KEY) : null;
+export const getRefreshToken = () =>
+  isBrowser ? localStorage.getItem(REFRESH_TOKEN_KEY) : null;
 
 export const setTokens = (accessToken: string, refreshToken: string) => {
+  if (!isBrowser) return;
   localStorage.setItem(ACCESS_TOKEN_KEY, accessToken);
   localStorage.setItem(REFRESH_TOKEN_KEY, refreshToken);
 };
 
 export const clearTokens = () => {
+  if (!isBrowser) return;
   localStorage.removeItem(ACCESS_TOKEN_KEY);
   localStorage.removeItem(REFRESH_TOKEN_KEY);
 };