Cannot build project in SPA mode (v1.0.0)

[yuliankarapetkov]

Describe the bug

I just created a new SvelteKit project and followed the instructions to switch to SPA mode. Running the project locally works as expected but when trying to build it, I get an error (see logs).

I tried all the suggestions in the error log and in the adapter-static home page, but none of them worked.

I have an older project of mine where my SvelteKit version is 1.0.0-next.528 and adapter-static is 1.0.0-next.46 and I can both run the project locally and build it.

So this bug must have been introduced in a later version.

Reproduction

1. Create a new SvelteKit project (read more)
2. Install adapter-static - npm i -D @sveltejs/adapter-static
3. Update svelte.config.js to the following:

// svelte.config.js
import adapter from '@sveltejs/adapter-static';

export default {
  kit: {
    adapter: adapter({
      fallback: 'app.html'
    }),
    prerender: { entries: [] }
  }
};

4. Create a layout.js (or .ts) in /routes
5. Add the following to layout.js - export const ssr = false;
6. Run npm run build

Logs

> Using @sveltejs/adapter-static
  @sveltejs/adapter-static: all routes must be fully prerenderable, but found the following routes that are dynamic:
    - src/routes/
  
  You have the following options:
    - set the `fallback` option — see https://github.com/sveltejs/kit/tree/master/packages/adapter-static#spa-mode for more info.
    - add `export const prerender = true` to your root `+layout.js/.ts` or `+layout.server.js/.ts` file. This will try to prerender all pages.
    - add `export const prerender = true` to any `+server.js/ts` files that are not fetched by page `load` functions.
  
    - pass `strict: false` to `adapter-static` to ignore this error. Only do this if you are sure you don't need the routes in question in your final app, as they will be unavailable. See https://github.com/sveltejs/kit/tree/master/packages/adapter-static#strict for more info.
  
  If this doesn't help, you may need to use a different adapter. @sveltejs/adapter-static can only be used for sites that don't need a server for dynamic rendering, and can run on just a static file server.
  See https://kit.svelte.dev/docs/page-options#prerender for more details
error during build:
Error: Encountered dynamic routes
    at adapt (file:///Users/yulian/Code/svelte-latest/node_modules/@sveltejs/adapter-static/index.js:53:12)
    at adapt (file:///Users/yulian/Code/svelte-latest/node_modules/@sveltejs/kit/src/core/adapt/index.js:28:8)
    at Object.handler (file:///Users/yulian/Code/svelte-latest/node_modules/@sveltejs/kit/src/exports/vite/index.js:611:12)
    at async PluginDriver.hookParallel (file:///Users/yulian/Code/svelte-latest/node_modules/rollup/dist/es/shared/rollup.js:23482:17)
    at async Object.close (file:///Users/yulian/Code/svelte-latest/node_modules/rollup/dist/es/shared/rollup.js:24837:13)
    at async Promise.all (index 0)
    at async build (file:///Users/yulian/Code/svelte-latest/node_modules/vite/dist/node/chunks/dep-0bae2027.js:44326:13)
    at async CAC.<anonymous> (file:///Users/yulian/Code/svelte-latest/node_modules/vite/dist/node/cli.js:808:9)

System Info

System:
    OS: macOS 13.1
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 47.89 MB / 16.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 19.2.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 8.19.3 - /usr/local/bin/npm
  Browsers:
    Brave Browser: 108.1.46.144
    Chrome: 108.0.5359.124
    Firefox: 105.0.1
    Safari: 16.2
  npmPackages:
    @sveltejs/adapter-auto: ^1.0.0 => 1.0.0 
    @sveltejs/adapter-static: ^1.0.0 => 1.0.0 
    @sveltejs/kit: ^1.0.0 => 1.0.1 
    svelte: ^3.54.0 => 3.55.0 
    vite: ^4.0.0 => 4.0.3

Severity

serious, but I can work around it

Additional Information

Technically it's blocking an upgrade but I can postpone it for now.

[dummdidumm]

I can't reproduce this given the steps. Please provide a reproduction repository.

[yuliankarapetkov]

@dummdidumm Here it is: https://github.com/yuliankarapetkov/svelte-latest

[tomoam]

@yuliankarapetkov ~~please add prerender = true with ssr = false.~~

There seems to be a mistake in the configuration. https://github.com/yuliankarapetkov/svelte-latest/blob/master/svelte.config.js#L10-L19

The following will fix it.

	kit: {
		adapter: adapter({
			fallback: 'app.html'
		}),
		prerender: { entries: [] }
	}

[gigor]

Had a similar problem with the following error on the build:

error during build:
Error: The fallback option no longer exists — use builder.generateFallback(fallback) instead

The problem was with the wrong version of @sveltejs/adapter-static, which was still set on 1.0.0-next.48. Updating to latest solved everything.

[yuliankarapetkov]

There seems to be a mistake in the configuration. https://github.com/yuliankarapetkov/svelte-latest/blob/master/svelte.config.js#L10-L19

Oh wow, how did I miss that! I'm sorry! 🤦‍♂️

Fixing the config and adding prerender = false both fixed the issue for me. Thank you!

[dummdidumm]

Closing as the issue has been resolved