Nested Layout using a Route Function:

+route.js

// /pages/product/+route.js

// This Route Function is for a Nested Layout implementation.
// It implements a route with multiple parameters.
// See:
//  - https://vike.dev/route-function
//  - https://vike.dev/Layout
export { route }

import { resolveRoute } from 'vike/routing'

function route(pageContext) {
  {
    const result = resolveRoute('/product/@id', pageContext.urlPathname)
    if (result.match) {
      result.routeParams.view = 'overview'
      return result
    }
  }
  {
    const result = resolveRoute('/product/@id/reviews', pageContext.urlPathname)
    if (result.match) {
      result.routeParams.view = 'reviews'
      return result
    }
  }
  {
    const result = resolveRoute('/product/@id/pricing', pageContext.urlPathname)
    if (result.match) {
      result.routeParams.view = 'pricing'
      return result
    }
  }
  return false
}