fix: type auto-completion for path prop

Author: bgub

packages/next/src/server/lib/router-utils/typegen.ts

@@ -373,7 +373,7 @@ export type LinkPropsWithPath<T extends Routes> = LinkRestProps &
         href?: never;
       });
 
-export type LinkProps<RouteType extends string = string> =
+export type LinkProps<RouteType extends string = Routes> =
   | LinkPropsWithHref<RouteType>
   | (RouteType extends Routes ? LinkPropsWithPath<RouteType> : never);
 
@@ -400,7 +400,7 @@ declare module 'next/link' {
    * </Link>
    * \`\`\`
    */
-  export default function Link<RouteType extends string = string>(
+  export default function Link<RouteType extends string = Routes>(
     props: LinkProps<RouteType> & { children: React.ReactNode }
   ): JSX.Element;
 }

test/e2e/app-dir/typed-routes/app/dashboard/page.tsx

@@ -4,8 +4,11 @@ export default function DashboardPage(props: PageProps<'/dashboard'>) {
   return (
     <div>
       <p>Dashboard Home</p>
-      <Link href="/shop/">Settings</Link>
-      <Link href="/about">About</Link>
+      <Link href="/shop/testing/hello">Settings</Link>
+      <Link href="/blog/hey">About</Link>
+      <Link path="/blog/[slug]" params={{ slug: 'hey' }}>
+        Hey
+      </Link>
     </div>
   )
 }