Support Type for route.ts parameter context

[devjiwonchoi]

Goals

Support type for route.ts parameter context, assuming extensions of context.

Add NextContext type for route.ts

export type NextContext = {
  params: {
    slug: string[]
    // Assuming additional features?
  }
  // Assuming additional features?
}

// app/blog/[...slug]/route.ts
import type { NextContext } from 'next/server'

export async function GET(request: Request, context: NextContext}) {
 const { params } = context // '/blog/1/2' returns { slug: ['1', '2'] }
}

Alternative

Manually add type for context

// app/blog/[...slug]/route.ts

export async function GET(request: Request, context: { params: { slug: string[] } }) {
 const { params } = context // '/blog/1/2' returns { slug: ['1', '2'] }
}

Proposal

I am willing to contribute.

[devjiwonchoi]

Assuming this is the current type passed to context?

next.js/packages/next/src/server/future/route-modules/app-route/module.ts

Lines 64 to 70 in 654bd8c

	/**
	* AppRouteHandlerFnContext is the context that is passed to the handler as the
	* second argument.
	*/
	type AppRouteHandlerFnContext = {
	params?: Record<string, string | string[]>
	}

[ptvty]

Any updates on this?
It's a pain to create types manually for large projects with lots of routes, while it can be inferred automatically form the directory structure.

AFAIK TanStack Start is offering this using a Codegen that monitors changes in the file system and generates types accordingly. (Check routeTree.gen.ts file)
I'm willing to contribute.