refactor: Get rid of usages of Next.js private interfaces in our codebase (calcom#23080)

* chore: do not use nextjs private interfaces

* fix type check

* fix

* fix

* refactor

Author: hbjORbj

apps/web/app/_types.ts

@@ -13,5 +13,5 @@ export type PageProps = {
 
 export type LayoutProps = { params: Promise<Params>; children: React.ReactElement };
 
-export { type ReadonlyHeaders } from "next/dist/server/web/spec-extension/adapters/headers";
-export { type ReadonlyRequestCookies } from "next/dist/server/web/spec-extension/adapters/request-cookies";
+export type ReadonlyHeaders = Awaited<ReturnType<typeof import("next/headers").headers>>;
+export type ReadonlyRequestCookies = Awaited<ReturnType<typeof import("next/headers").cookies>>;

apps/web/lib/buildLegacyCtx.tsx

@@ -1,8 +1,7 @@
 import type { SearchParams } from "app/_types";
 import { type Params } from "app/_types";
+import type { ReadonlyHeaders, ReadonlyRequestCookies } from "app/_types";
 import type { GetServerSidePropsContext, NextApiRequest } from "next";
-import { type ReadonlyHeaders } from "next/dist/server/web/spec-extension/adapters/headers";
-import { type ReadonlyRequestCookies } from "next/dist/server/web/spec-extension/adapters/request-cookies";
 
 const createProxifiedObject = (object: Record<string, string>) =>
   new Proxy(object, {

apps/web/pages/_app.tsx

@@ -1,6 +1,6 @@
 import type { IncomingMessage } from "http";
+import type { NextPageContext } from "next";
 import { SessionProvider } from "next-auth/react";
-import type { AppContextType } from "next/dist/shared/lib/utils";
 import React from "react";
 import CacheProvider from "react-inlinesvg/provider";
 
@@ -32,8 +32,8 @@ declare global {
   }
 }
 
-MyApp.getInitialProps = async (ctx: AppContextType) => {
-  const { req } = ctx.ctx;
+MyApp.getInitialProps = async ({ ctx }: { ctx: NextPageContext }) => {
+  const { req } = ctx;
 
   let newLocale = "en";
 

packages/features/auth/lib/getLocale.ts

@@ -2,11 +2,12 @@ import { parse } from "accept-language-parser";
 import { lookup } from "bcp-47-match";
 import type { GetTokenParams } from "next-auth/jwt";
 import { getToken } from "next-auth/jwt";
-import { type ReadonlyHeaders } from "next/dist/server/web/spec-extension/adapters/headers";
-import { type ReadonlyRequestCookies } from "next/dist/server/web/spec-extension/adapters/request-cookies";
 
 import { i18n } from "@calcom/config/next-i18next.config";
 
+type ReadonlyHeaders = Awaited<ReturnType<typeof import("next/headers").headers>>;
+type ReadonlyRequestCookies = Awaited<ReturnType<typeof import("next/headers").cookies>>;
+
 /**
  * This is a slimmed down version of the `getServerSession` function from
  * `next-auth`.