lint 수정

server/clientAPI/APIPathGen.ts

@@ -10,8 +10,9 @@ export function APIPathGen<T extends object, V>(
                 throw new Error('Symbol is not supported');
             }
 
-            if(map.has(key)){
-                return map.get(key)!;
+            const cachedResult = map.get(key);
+            if(cachedResult !== undefined){
+                return cachedResult;
             }
 
             const nextPath = [...path, key];