SvelteKit

Reference Repositories

• SvelteKit - Svelte application framework for routing, server rendering, form actions, and adapters
• Svelte - Svelte 5 compiler and runtime

Upstream Grounding

When SvelteKit load behavior, invalidation, cookies, hooks, env handling, server-only modules, generated $types, or adapter behavior affects correctness, ask DeepWiki a narrow question against sveltejs/kit before relying on memory. Verify decisive details against local installed types and source.

Use the svelte skill for component runes and template mechanics.

Server Versus Universal Code

• Use +page.server.ts or +layout.server.ts for secrets, database access, auth, cookies, and locals.
• Use universal +page.ts or +layout.ts only for client-safe data and behavior.
• Keep server-only code in $lib/server, .server modules, hooks.server.ts, +server.ts, or server route files.
• Server load return values must be serializable.
• Do not store shared mutable request state in server modules or load functions. Put per-request state in event.locals.

Loading, Invalidation, And Forms

• Use depends, invalidate, invalidateAll, and untrack deliberately. Do not assume server fetches are invalidation-trackable unless the dependency is explicit.
• Define form actions in +page.server.ts.
• Use fail() for validation failures so the page keeps form state and status.
• Use use:enhance only for POST forms.
• Put auth and session lookup in hooks.server.ts, then expose the request result through event.locals.

Types And Boundaries

• Import generated route types from ./$types in route files.
• Keep env reads in server code unless the value is intentionally public.
• Keep redirects and errors explicit with SvelteKit helpers so status codes survive SSR and client navigation.