SvelteKit

SvelteKit 3.0 moves core types and utilities to new module paths (such as $app/server, @sveltejs/kit/hooks, @sveltejs/kit/env, $app/state), adds refreshAll, lets adapters supply extra Vite plugins, and enforces stricter navigation, cookie, and error-handling behavior. Upgrading requires Node 22.17+, Vite 8, Svelte 5.56.4+, TypeScript 6, @sveltejs/vite-plugin-svelte v7, replacing $lib with #lib, removing $app/stores and @sveltejs/kit/node/polyfills, and updating code that relied on the now-removed preloadStrategy, createEntries, and generateManifest APIs.

Matters for: Teams maintaining production SvelteKit applications with custom adapters, server hooks, or Vite plugin integrations who need to plan a coordinated upgrade across their Node, Vite, and Svelte versions.

SvelteKit now ships a Bun-native adapter that supports static file serving and building single-executable binaries, with the server built via Vite instead of a second Bun.build pass. This adapter requires Bun 1.4 and bundles Svelte dependencies and dev dependencies rather than externalizing them.

Matters for: Useful for teams deploying SvelteKit apps as standalone Bun executables or relying on Bun's runtime for production serving.