refactor: userStore 클래스 문법 제거

src/components/layout/Header.js

@@ -1,7 +1,7 @@
 import userStore from "@/store/userStore";
 
 const Header = () => {
-  const isLogin = !!userStore.getUser();
+  const isLogin = userStore.isLogin();
   const path = window.location.pathname;
   // 석호님 코드 따라하기
   const activeStyle = "text-blue-600 font-bold";

src/main.js

@@ -25,16 +25,16 @@ addRoutes(
 );
 
 function validateRouteUser(path) {
-  const user = userStore.getUser();
-  if (!user && path === "/profile") path = "/login";
-  if (user && path === "/login") path = "/";
+  const isLogin = userStore.isLogin();
+  if (!isLogin && path === "/profile") path = "/login";
+  if (isLogin && path === "/login") path = "/";
   return path;
 }
 
 function validateHashRouteUser(hash) {
-  const user = userStore.getUser();
-  if (!user && hash === "#/profile") hash = "#/login";
-  if (user && hash === "#/login") hash = "#/";
+  const isLogin = userStore.isLogin();
+  if (!isLogin && hash === "#/profile") hash = "#/login";
+  if (isLogin && hash === "#/login") hash = "#/";
   return hash;
 }
 

src/store/userStore.js

@@ -1,31 +1,28 @@
-class UserStore {
-  constructor() {
-    if (UserStore.instance) {
-      return UserStore.instance;
-    }
-    UserStore.instance = this;
-    this.user = localStorage.getItem("user")
-      ? JSON.parse(localStorage.getItem("user"))
-      : null;
-  }
+let user = JSON.parse(localStorage.getItem("user"));
 
-  setUser(user) {
-    localStorage.setItem("user", JSON.stringify(user));
-    this.user = user;
-  }
+function setUser(newUser) {
+  localStorage.setItem("user", JSON.stringify(newUser));
+  user = newUser;
+}
 
-  deleteUser() {
-    localStorage.removeItem("user");
-    this.user = null;
-  }
+function deleteUser() {
+  localStorage.removeItem("user");
+  user = null;
+}
 
-  getUser() {
-    return this.user;
-  }
+function getUser() {
+  return user;
+}
 
-  isLogin() {
-    return !!this.user;
-  }
+function isLogin() {
+  return !!user;
 }
 
-export default new UserStore();
+const userStore = {
+  setUser,
+  deleteUser,
+  getUser,
+  isLogin,
+};
+
+export default userStore;