fix: undefined to null

src/app/unsubscribe/layout.tsx

@@ -1,3 +1,4 @@
+'use client'
 import { useRouter } from "next/navigation";
 
 import React, { ReactNode } from "react";

src/subscription/hooks/useArticleInfo.tsx

@@ -3,8 +3,8 @@ import { useEffect, useState } from "react"
 import { getCookie } from "@subscription/utils"
 
 export const useArticleInfo = () =>{
-    const [articleId, setArticleId] = useState<string | undefined>(undefined)
-    const [workbookId, setWorkbookId] = useState<string | undefined>(undefined)
+    const [articleId, setArticleId] = useState<string | null>(null)
+    const [workbookId, setWorkbookId] = useState<string | null>(null)
 
     useEffect(function getArticleInfo () {
         const curArticleId = getCookie('articleId');

src/subscription/hooks/useUnsubscribeForm.tsx

@@ -15,7 +15,7 @@ import { zodResolver } from "@hookform/resolvers/zod";
 
 export const useUnsubscribeForm = () => {
   const { toast } = useToast();
-  const [email, setEmail] = useState<string | undefined>(undefined);
+  const [email, setEmail] = useState<string | null>(null);
 
   useEffect(function getEmailFromCookie() {
     const userEmail = getCookie('user-email');

src/subscription/remotes/postUnsubscriptionQueryOptions.ts

@@ -15,7 +15,7 @@ export const unsubscribeWorkbook = (
   return axiosRequest("post", API_ROUTE.UNSUBSCRIBE(), body);
 };
 
-export const unsubscribeWorkbookOptions = (email: string | undefined): UseMutationOptions<
+export const unsubscribeWorkbookOptions = (email: string | null): UseMutationOptions<
   ApiResponse<MessageOnlyResponse>,
   Error,
   UnsubscribeBody

src/subscription/utils/index.ts

@@ -1,8 +1,8 @@
-export const getCookie = (name: string): string | undefined => {
+export const getCookie = (name: string): string | null => {
   const value = `; ${document.cookie}`;
   const parts = value.split(`; ${name}=`);
   if (parts.length === 2) {
-    return parts.pop()?.split(";").shift();
+    return parts.pop()?.split(";").shift() as string
   }
-  return undefined;
+  return null;
 };