`svelte-kit sync` fails without `./src/routes` directory

[furudean]

Describe the bug

When svelte-kit sync runs during the prepare hook you're met with this ugly error if you don't have a routes directory in src

> ENOENT: no such file or directory, scandir '/path/to/my/project/src/routes'

If your project primarily uses svelte-kit package then you don't need a routes directory. Since git doesn't clone empty directories the issue is a bit more serious than it seems.

Reproduction

npm init svelte my-app
cd my-app
rm -rf src/routes
npm install

Logs

No response

System Info

N/A

Severity

annoyance

Additional Information

No response

[elliott-with-the-longest-name-on-github]

@Rich-Harris I've been wanting to dig into sync. Want me to take a look?

[Rich-Harris]

that would be super helpful, thanks! i'd wager we just need to wrap

kit/packages/kit/src/core/sync/create_manifest_data/index.js

Line 87 in 01d9d30

list_files(config.kit.files.routes).forEach((file) => {

in an if block, but i haven't tested that hypothesis

[elliott-with-the-longest-name-on-github]

@Rich-Harris

Your hunch was correct! #5008. Looks like there's an issue with the Vercel deployments and it was attacked by the "renders error page for missing page" test monster, but everything tests successfully when run locally on Ubuntu and Windows.