feat(WEB-104): add on-demand revalidation for cache

lib/request.ts

@@ -6,18 +6,22 @@ import { cache } from "react"
 import type { Data } from "@/types/request"
 import type { DocumentNode } from "graphql"
 
+const client = new GraphQLClient(env.CMS_URL, {
+  fetch: cache(async function (url: URL | RequestInfo, params: RequestInit | undefined) {
+    return fetch(url, params)
+  }),
+})
+
 export async function request<T>(
   query: string | DocumentNode,
   variables?: {},
   next?: NextFetchRequestConfig
 ): Promise<Data<T>> {
   try {
-    const client = new GraphQLClient(env.CMS_URL, {
-      fetch: cache(async function (url: URL | RequestInfo, params: RequestInit | undefined) {
-        return fetch(url, params)
-      }),
-      next,
-    })
+
+    if (next) {
+      client.requestConfig.next = next
+    }
 
     if (env.PRINT_QUERY) {
       const print = (await import("graphql/language/printer")).print