Layout for route.ts

[nisabmohd]

Goals

1. A route to run before a route path similar to layout for pages
2. It can help in custom logic for few route handlers
3. Authentication and Authorisation will be easy
4. router.ts runs before the api called at route.ts
5. Same as route groups we can have router to wrap all APIs for nested routes

Non-Goals

No response

Background

The current alternative is middleware.ts in which the code become verbose and multiple custom cases cannot be done. Using this can specify what to do before an api call.

Proposal

This feature will be same as the app router page and layouts are implemented. The layout can wrap a whole bunch of route similarly am api route can also be wrapped with router for specific route behaviour before calling.