SvelteKit development mode generates error messages.

[andriytyurnikov]

npm run dev
...
3:49:46 AM [vite] ✨ new dependencies optimized: @vercel/speed-insights/sveltekit
3:49:46 AM [vite] ✨ optimized dependencies changed. reloading
Error: Not found: /_vercel/speed-insights/vitals
    at resolve (/node_modules/@sveltejs/kit/src/runtime/server/respond.js:483:13)
    at resolve (/node_modules/@sveltejs/kit/src/runtime/server/respond.js:277:5)
    at #options.hooks.handle (/node_modules/@sveltejs/kit/src/runtime/server/index.js:49:56)
    at Module.respond (/node_modules/@sveltejs/kit/src/runtime/server/respond.js:274:40)

[smart]

I see this as well. I'm on sveltekit2.0 if that matters.

[smart]

Interesting the README says to put the initialization in your +layout.svelte file but the example has it in +layout.ts

layout.svelte is correct, since it needs to be in the markup. I just wrapped in a dev check to disable it in development.

[feugy]

Hello and thank you for the bug report.
I've fixed the README: the best way to use injectSpeedInsights() function is in the +layout.ts/js file (which will be run on server side), as per our docs

However, I'm not seeing any error in console.
Could you please provide the version of @vercel/speed-insights and sveltekit that you're using?

Thanks a million.