Migrating 8 SvelteKit Sites to Vite 8 in a day: What We Learned

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TL;DR: Vite 8's breaking changes for SvelteKit + Cloudflare Workers are small: bump @sveltejs/vite-plugin-svelte across its major (6→7), rename a few config keys ( rollupOptions → rolldownOptions , esbuild → oxc ), drop the manualChunks object form, and make sure vitest is on 4.x. Our 8-site migration took a day, builds got 10-15% faster, and nothing shipped broken. Vite 8 dropped on March 12,…

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