Error in adapter-static when using `paths.base` and import assets

[ota-meshi]

Describe the bug

If I set paths.base, import .png or .svg, set it to src of <img> tag, and build using @sveltejs/adapter-static, I will get a 404 error.

<script>
	import logo from './svelte-logo.svg';
</script>

<header>
	<div class="corner">
		<a href="https://kit.svelte.dev">
			<img src={logo} alt="SvelteKit" />
		</a>
	</div>

Error: 404 /_app/immutable/assets/svelte-logo-87df40b8.svg does not begin with `base`, which is configured in `paths.base` and can be imported from `$app/paths` (linked from /foo/about)
    at eval (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/prerender.js:65:11)
    at visit (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/prerender.js:231:4)
    at Object.eval [as fn] (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/prerender.js:221:22)
    at dequeue (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/queue.js:53:42)
    at eval (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/queue.js:62:7)

Reproduction

https://stackblitz.com/edit/sveltejs-kit-template-default-sdspxa?file=src/lib/header/Header.svelte

• open link
• run npm run build

Logs

~/projects/sveltejs-kit-template-default-sdspxa 9s
❯ npm run build
$ vite build
vite v3.1.0 building for production...
✓ 52 modules transformed.
vite v3.1.0 building SSR bundle for production...
✓ 65 modules transformed.
.svelte-kit/output/server/vite-manifest.json                    3.07 KiB
.svelte-kit/output/server/index.js                              65.91 KiB
.svelte-kit/output/server/entries/pages/_layout.svelte.js       4.06 KiB
.svelte-kit/output/server/entries/fallbacks/error.svelte.js     0.60 KiB
.svelte-kit/output/server/entries/pages/_page.svelte.js         7.10 KiB
.svelte-kit/output/server/entries/pages/_page.js                0.05 KiB
.svelte-kit/output/server/entries/pages/about/_page.svelte.js   1.25 KiB
.svelte-kit/output/server/entries/pages/about/_page.js          0.09 KiB
.svelte-kit/output/server/entries/pages/todos/_page.svelte.js   5.93 KiB
.svelte-kit/output/server/entries/pages/todos/_page.server.js   1.35 KiB
.svelte-kit/output/server/chunks/index.js                       4.15 KiB
.svelte-kit/output/server/chunks/index2.js                      0.97 KiB
.svelte-kit/output/server/chunks/index3.js                      1.29 KiB
.svelte-kit/output/server/chunks/stores.js                      1.00 KiB
.svelte-kit/output/server/chunks/hooks.server.js                0.28 KiB
Error: 404 /_app/immutable/assets/svelte-logo-87df40b8.svg does not begin with `base`, which is configured in `paths.base` and can be imported from `$app/paths` (linked from /foo/about)
    at eval (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/prerender.js:65:11)
    at visit (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/prerender.js:231:4)
    at Object.eval [as fn] (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/prerender.js:221:22)
    at dequeue (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/queue.js:53:42)
    at eval (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/core/prerender/queue.js:62:7)
[vite-plugin-svelte-kit] Prerendering failed with code 1
error during build:
Error: Prerendering failed with code 1
    at ChildProcess.eval (file:///home/projects/sveltejs-kit-template-default-sdspxa/node_modules/@sveltejs/kit/src/exports/vite/index.js:454:15)
    at EventEmitter.emit (https://sveltejs-kit-template-default-sdspxa.w.staticblitz.com/blitz.a493d9b6541a4dd5b019a965004167e4adff5f2b.js:6:155574)
    at ChildProcess._handle.onexit (https://sveltejs-kit-template-default-sdspxa.w.staticblitz.com/blitz.a493d9b6541a4dd5b019a965004167e4adff5f2b.js:6:956236)
    at https://sveltejs-kit-template-default-sdspxa.w.staticblitz.com/blitz.a493d9b6541a4dd5b019a965004167e4adff5f2b.js:15:382032
    at _0x15340f (https://sveltejs-kit-template-default-sdspxa.w.staticblitz.com/blitz.a493d9b6541a4dd5b019a965004167e4adff5f2b.js:15:144844)
    at https://sveltejs-kit-template-default-sdspxa.w.staticblitz.com/blitz.a493d9b6541a4dd5b019a965004167e4adff5f2b.js:15:144593

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (4) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 16.14.2 - /usr/local/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 7.17.0 - /usr/local/bin/npm
  npmPackages:
    @sveltejs/adapter-auto: next => 1.0.0-next.73 
    @sveltejs/adapter-static: * => 1.0.0-next.43 
    @sveltejs/kit: next => 1.0.0-next.481 
    svelte: ^3.46.0 => 3.50.1 
    vite: ^3.1.0 => 3.1.0

Severity

annoyance

Additional Information

This issue seems to be from 1.0.0-next.475.
Perhaps the #6621 PR change introduced a bug.

I think we probably need to fix packages/kit/src/exports/vite/build/utils.js.

Before:

kit/packages/kit/src/exports/vite/build/utils.js

Lines 149 to 151 in 616ec7a

	export function assets_base(config) {
	return config.paths.assets + '/' || config.paths.base + '/' || './';
	}

After:

 export function assets_base(config) { 
 	return (config.paths.assets || config.paths.base || '.') + '/'; 
 }