Get `RouteId` string from a route at run/compiletime

Describe the problem

I don't want to rely on magic strings to do my routing.

Describe the proposed solution

import {routeId} from '$routes/foo/[bar]/baz';

routeId === "/foo/[bar]/baz;"

Alternatives considered

Currently I am doing

/foo/[bar]/baz/index.ts

import type { RouteId } from "./$types";

export const routeId: RouteId = "/foo/[bar]/baz";

Which is /okay/ becasue typescript tells me off if the route has changed, but it would be good if there was a builtin.

I'm currently using oob sveltekit so I'm not sure if there is an acceptable generalised solution for e.g. custom routing.

Importance

nice to have

Additional Information

No response

Start with /foo/[bar]/baz/index.ts and its ./ $types import to understand the current typed RouteId pattern. Trace how route IDs are generated or exposed, then verify that the proposed routeId entry point provides the route ID at compile time and remains type-safe when the route changes.