Preloading

The router supports lazy route resources and a route prepare lifecycle. Use this to load code and derive route-specific data before rendering.

Preparation receives route context such as variables and filters. Keep prepare logic deterministic: it should depend on the matched route and URL state, not on ambient mutable state.

Practical guidance

• Keep route resources lazy where this improves bundle boundaries.
• Return only the route data the page needs.
• Use Suspense and explicit fallbacks for loading states.
• Clean up router instances in tests or disposable shells.