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SvelteKit

SvelteKit (svelte.dev/docs/kit) is the Svelte-team's application framework for Svelte, built on top of Vite with file-based routing, server-side rendering, and server endpoints. Part of the Vite-based framework family alongside Astro, Nuxt, Remix.

Stub

This page covers only what currently-ingested sources name about SvelteKit. Broader SvelteKit internals (form actions, load functions, adapters, SSR/CSR/SSG modes) are out of scope until a source discusses them.

Relevance to the wiki (2026-04-21)

Worked-example framework in Vercel's 2026-04-21 WDK post — the post walks the SvelteKit integration in detail as the case study for the two-phase framework integration pattern:

• Build-time: SvelteKit expects handlers named +server.js under src/routes/*; WDK's SvelteKit builder outputs two esbuild bundles (step-mode + workflow-mode) into src/routes/.well-known/workflow/v1.
• Runtime: SvelteKit's file-based routing auto-discovers the +server.js files as HTTP endpoints — "as long as the file is named +server.js. No manual wiring needed."

Relevant framework properties (named by ingested sources)

• File-based routing — canonical file- based-routing framework; routes are files under src/routes/.
• +server.js convention — SvelteKit-specific server endpoint filename. WDK outputs generated handlers under this name to leverage auto-discovery.
• Custom request object — SvelteKit passes a custom request object to route handlers, not the standard Web Request API. This is the friction that motivates WDK's injected request-object converter — convertSvelteKitRequest bridges the gap.
• Vite-based — builds via Vite; WDK hooks into Vite's hotUpdate lifecycle for HMR via patterns/vite-hotupdate-directive-triggered-rebuild.

Adoption datum

Per Vercel's 2026-04-21 post verbatim: "The SvelteKit integration alone brought workflows to thousands of developers already building in that ecosystem." Marketing-register claim.

Seen in

• sources/2026-04-21-vercel-inside-workflow-devkit-how-framework-integrations-work — canonical wiki introduction. SvelteKit is WDK's integration case study: Vite-based build, file-based routing with +server.js convention, custom request object requiring the converter adapter.

Related

• systems/vite — SvelteKit's build substrate.
• systems/rollup — Vite 7's production bundler (used for SvelteKit's client-mode compilation in the WDK integration).
• systems/astro, systems/nextjs — sibling file-based-routing frameworks.
• systems/vercel-workflow — the 2026-04-21 worked-example integration.
• concepts/file-based-routing-vs-bare-http-framework-taxonomy — the taxonomy SvelteKit anchors.
• patterns/vite-hotupdate-directive-triggered-rebuild — WDK's HMR pattern for SvelteKit.
• patterns/injected-request-object-converter — WDK's adapter for SvelteKit's custom request object.