wrapInitialProps typing

src/next-lib.ts

@@ -1,4 +1,5 @@
 import axios from 'axios'
+import { NextPageContext } from 'next'
 
 export interface IResponseItems<T> {
     items: T[]
@@ -20,8 +21,8 @@ export async function requestGet<T>(url: string, defaultResponse: T): Promise<T>
  * 
  * @param {*} fn 
  */
-export function wrapInitialProps(fn) {
-    return async ctx => {
+export function wrapInitialProps(fn: (ctx: NextPageContext) => void) {
+    return async (ctx: NextPageContext) => {
         if (process.env.NODE_ENV === 'production' && process.browser) {
             return window['__NEXT_DATA__'].props.pageProps;
         }