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Base Path Deployment ​

Problem ​

Hosting an SPA under a subdirectory (e.g., /my-app) requires every pushState call and route definition to carry the prefix, coupling deployment details into application code.

Solution ​

Set base once at router creation. All route definitions, url(), navigate(), and resolve() are then base-agnostic.

ts
import { createRouter } from '@vielzeug/wayfinder';

const router = createRouter({
  base: '/my-app',
  routes: {
    home: { path: '/' },
    about: { path: '/about' },
    userDetail: { path: '/users/:id', data: async ({ params }) => fetchUser(params.id) },
  },
  notFound: { component: NotFoundPage },
});

await router.navigate({ name: 'about' }); // pushes /my-app/about
const href = router.url('userDetail', { id: '7' }); // '/my-app/users/7'
const branch = router.resolve('/my-app/users/7'); // strips base: params.id = '7'

Pitfalls ​

  • The server must rewrite all requests under /my-app/* to serve the SPA entry file. Without this, direct link access to /my-app/about returns 404.
  • When using resolve(), always pass the full URL including the base prefix. Wayfinder strips the base internally.
  • Do not set base in development if vite.config.ts already sets base: '/my-app'; double-prefixing breaks all navigation.