errrr... whatever this is

[Rich-Harris]

navigating from https://learn.svelte.dev/tutorial/event to https://learn.svelte.dev/tutorial/handle-fetch (the next exercise) results in this Not Found message:

[tomoam]

Reloading the iframe if the *server.js files are included will make it better, but it seems that this error still flickers for a moment (I have created #356 for explanation).

It may be necessary to programmatically restart the Vite process to completely hide this error from the user.