How do you define routes in TanStack Router with Vue?

Use createRootRoute() for the layout root and createRoute() for each page. Routes are assembled into a typed tree and passed to createRouter().

// routes/__root.ts
import { createRootRoute, RouterOutlet } from "@tanstack/vue-router"
import { h } from "vue"
export const rootRoute = createRootRoute({
  component: ()=>h("div",null,[h(RouterOutlet)]),
})

// routes/users/$userId.ts — $ marks a dynamic segment
import { createRoute } from "@tanstack/vue-router"
import UserDetailPage  from "../pages/UserDetailPage.vue"
export const userDetailRoute = createRoute({
  getParentRoute: ()=>rootRoute,
  path:           "/users/$userId",
  component:      UserDetailPage,
})

// Assemble the tree
const routeTree = rootRoute.addChildren([userDetailRoute])
export const router = createRouter({ routeTree })

// Access typed params in a component
import { useParams } from "@tanstack/vue-router"
const { userId } = useParams({ from:"/users/$userId" })
// userId typed as string; TS error on wrong param name

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