Change type of GetServerSidePropsContext.req.cookies the be the same …

…as NextApiRequest.cookies (#21336)

The original type for `GetServerSidePropsContext.req.cookies` was introduced in #19724. In the PR, the test at `test/integration/typescript/test/index.test.js` expects req.cookies to always exist, so `req.cookies` will never be undefined.

I'm guessing that req.cookies is parsed using the same cookie middleware as `NextApiRequest`, in which case `req.cookies` should be `{ [key: string]: string }`, not `{ [key: string]: any }`.

packages/next/next-server/server/render.tsx

@@ -44,7 +44,11 @@ import {
   NextComponentType,
   RenderPage,
 } from '../lib/utils'
-import { tryGetPreviewData, __ApiPreviewProps } from './api-utils'
+import {
+  tryGetPreviewData,
+  NextApiRequestCookies,
+  __ApiPreviewProps,
+} from './api-utils'
 import { denormalizePagePath } from './denormalize-page-path'
 import { FontManifest, getFontDefinitionFromManifest } from './font-utils'
 import { LoadComponentsReturnType, ManifestItem } from './load-components'
@@ -796,7 +800,9 @@ export async function renderToHTML(
 
       try {
         data = await getServerSideProps({
-          req,
+          req: req as IncomingMessage & {
+            cookies: NextApiRequestCookies
+          },
           res,
           query,
           resolvedUrl: renderOpts.resolvedUrl as string,

packages/next/types/index.d.ts

@@ -15,6 +15,11 @@ import {
   // @ts-ignore This path is generated at build time and conflicts otherwise
 } from '../dist/next-server/lib/utils'
 
+import {
+  NextApiRequestCookies,
+  // @ts-ignore This path is generated at build time and conflicts otherwise
+} from '../dist/next-server/server/api-utils'
+
 // @ts-ignore This path is generated at build time and conflicts otherwise
 import next from '../dist/server/next'
 
@@ -130,7 +135,7 @@ export type GetServerSidePropsContext<
   Q extends ParsedUrlQuery = ParsedUrlQuery
 > = {
   req: IncomingMessage & {
-    cookies?: { [key: string]: any }
+    cookies: NextApiRequestCookies
   }
   res: ServerResponse
   params?: Q