Paths (base and assets) should be set to '' in svelte-kit preview

[Rich-Harris]

Describe the bug
If you're using paths.base or paths.assets it's difficult/impossible to debug the production build locally. I would have thought that this...

kit/packages/kit/src/core/start/index.js

Lines 41 to 48 in 3d29d23

	app.init({
	paths: {
	base: '',
	assets: '/.'
	},
	prerendering: false,
	read: (file) => fs.readFileSync(join(config.kit.files.assets, file))
	});

...would be sufficient, but it turns out I would have been wrong

To Reproduce
Add paths config to a project, then svelte-kit build && svelte-kit preview

Expected behavior
It should work (where 'work' means 'load JS and CSS')

Severity
Right now, extremely damn high

[sidharthv96]

I've been deploying https://sidharthv96.github.io/mermaid-live-editor/ using github pages. So a baseURL is necessary.
I had to use some crude hacks to debug an issue I had in production which I could not reproduce locally as base path was not used.
To keep both environments in sync, It would be better to honour basePath in local if it is set.
Adding this works for all pages except the root.

kit/packages/kit/src/core/dev/index.js

Line 90 in 4dec03a

// base: `${this.config.kit.paths.base}/`,

So localhost:3000/mermaid-live-editor/edit would work, but localhost:3000/mermaid-live-editor/ would not.

[hperrin]

I'm hitting this issue recently too. At least I think it's the same issue. I'm seeing "_svelte_kit_assets" in the requests in npm run dev, but still getting a 404.

[hperrin]

Maybe I'm misunderstanding what "_svelte_kit_assets" is for. Am I supposed to provide that path myself?

[Rich-Harris]

closing this as out of date — base and assets (replaced with _svelte_kit_assets) are now used in dev and preview