next.js/packages/next/src/server/route-definitions/route-definition.ts

import type { RouteKind } from '../route-kind'

export interface RouteDefinition<K extends RouteKind = RouteKind> {
  readonly kind: K
  readonly bundlePath: string
  readonly filename: string
  /**
   * Describes the pathname including all internal modifiers such as
   * intercepting routes, parallel routes and route/page suffixes that are not
   * part of the pathname.
   */
  readonly page: string

  /**
   * The pathname (including dynamic placeholders) for a route to resolve.
   */
  readonly pathname: string
}