Unable to set adapter-static fallback when using bundleStrategy: inline

[stephenlrandall]

Describe the bug

Perhaps I'm missing something obvious here, but attempting to use bundleStrategy: inline with adapter-static in a fresh SvelteKit skeleton project produces the following errors:

My configuration is

import adapter from '@sveltejs/adapter-static';

/** @type {import('@sveltejs/kit').Config} */
const config = {
	kit: {
		adapter: adapter({
			pages: 'build',
			assets: 'build',
			fallback: 'index.html'
		}),
		output: {
			bundleStrategy: 'inline'
		}
	}
};

export default config;

Reproduction

Use npx sv create ... and modify the Svelte config file to the above after adding @sveltejs/adapter-static as a dependency.

Logs

[Error] Error: Not found: /Users/.../Desktop/single-page-test/build/index.html
	handleError (index.html:21:4246)
	Me (index.html:19:45323)
	(anonymous function) (index.html:19:42665)
	st (index.html:19:44185)
	ra (index.html:19:34874)
	(anonymous function) (index.html:19:34277)
[Error] Cross origin requests are only supported for HTTP.
	(anonymous function) (index.html:19:28564)
	r (index.html:19:28764)
	(anonymous function) (index.html:19:43111)
[Error] Fetch API cannot load file:///_app/version.json due to access control checks.
	(anonymous function) (index.html:19:28564)
	r (index.html:19:28764)
	(anonymous function) (index.html:19:43111)
[Error] Not allowed to load local resource: file:///favicon.ico

System Info

System:
    OS: macOS 15.2
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 144.17 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.8.0 - /usr/local/bin/node
    npm: 10.1.0 - /usr/local/bin/npm
    pnpm: 9.15.0 - ~/Library/pnpm/pnpm
  Browsers:
    Chrome: 131.0.6778.205
    Edge: 131.0.2903.112
    Safari: 18.2
  npmPackages:
    @sveltejs/adapter-auto: ^3.0.0 => 3.3.1 
    @sveltejs/adapter-static: ^3.0.0 => 3.0.8 
    @sveltejs/kit: ^2.0.0 => 2.15.0 
    @sveltejs/vite-plugin-svelte: ^4.0.0 => 4.0.4 
    svelte: ^5.0.0 => 5.15.0 
    vite: ^5.4.11 => 5.4.11

Severity

annoyance

Additional Information

Really happy to see this feature getting attention -- it's incredibly useful in certain environments.

[stephenlrandall]

If I don't specify a fallback and instead pre-render all pages, it seems to work. Unfortunately, I'm trying to create an SPA -- is this fundamentally incompatible with an inline build?

[gterras]

Static output still needs to be served from http as seen in the error message (so apache/nginx or such).

[khromov]

Hey @eltigerchino , I looked into this and I think the issue for you is that when you open the file the route is not / but instead /single-page-test/build/index.html

If you create a catch-all route like src/routes/[...rest]/+page.svelte you will see that it will be invoked. If you want the build to both work on a web server (served from root) and served from index.html, I think you need to get a bit creative with the routing to make sure it works in all cases.