Reproduction: Deploying SvelteKit to a Subfolder

Update

While this reproduction does show a bug in SvelteKit, it's not like I described below. I actually misconfigured the paths, like s3812497 described here: https://github.com/sveltejs/kit/issues/10358#issuecomment-1654297295

With a fixed config, the problem does not occur.

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Starting with SvelteKit 1.22.1, using adapter-static to deploy to a subfolder no longer works. It seems likely that the change from https://github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%401.22.1 is responsible:

perf: only have Vite generate relative paths when required

I noticed probably relevant changes in build/_app/immutable/entry/app.*.js:

• In 1.22.0, it loaded additional JS chunks from a relative path, like ../chunks/...
• In 1.22.1, it loads them from _app/immutable/chunks/..., which does not work.

@benmccann suggested that paths.relative may fix it, but it doesn't seem like that to me.

To see that it worked in SvelteKit 1.22.0:

1. pnpm i && pnpm i @sveltejs/[email protected] && pnpm build:normal
2. Go to http://localhost:8080/build/ – No errors in console

To see that it stopped working in SvelteKit 1.22.1:

1. pnpm i && pnpm i @sveltejs/[email protected] && pnpm build:normal
2. Go to http://localhost:8080/build/ – 404 errors in network inspector

To see that paths.relative does not fix it:

1. pnpm i && pnpm i @sveltejs/[email protected] && pnpm build:relative
2. Go to http://localhost:8080/build/ – Same 404 errors in network inspector