Unable to get @sveltejs/adapter-auto to detect Deno

[JosefSaltz]

Describe the bug

I'm running Deno 2.4.5 for my project that has a deno.lock file present. I have @sveltejs/adapter-auto dependency pinned to ^6.1.0 as per the latest release notes to utilize #14163. Running vite build related tasks yields: Could not detect a supported production environment. See https://svelte.dev/docs/kit/adapters to learn how to configure your app to run on the platform of your choosing

Reproduction

1. Create a new directory for a svelte kit project
2. Run deno run npm:sv create
3. Allow required permissions
4. Sveltekit minimal option
5. Yes, using Typescript syntax option
6. Allow required permissions
7. Add nothing to project
8. Run deno outdated -ui to update all dependencies to latest (ensure we use 6.1.0)
9. Ensure a deno.lock file is present
10. deno task build should yield:

Using @sveltejs/adapter-auto
Could not detect a supported production environment. See https://svelte.dev/docs/kit/adapters to learn how to configure your app to run on the platform of your choosing

Logs

josef@jSysD  ~/projects/reproduction-deno  deno task build
Task build vite build
▲ [WARNING] Cannot find base config file "./.svelte-kit/tsconfig.json" [tsconfig.json]

    tsconfig.json:2:12:
      2 │   "extends": "./.svelte-kit/tsconfig.json",
        ╵              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vite v7.1.4 building SSR bundle for production...
✓ 190 modules transformed.
vite v7.1.4 building for production...
✓ 143 modules transformed.
.svelte-kit/output/client/_app/version.json                        0.03 kB │ gzip:  0.05 kB
.svelte-kit/output/client/.vite/manifest.json                      2.74 kB │ gzip:  0.55 kB
.svelte-kit/output/client/_app/immutable/chunks/B_zhfS5Q.js        0.03 kB │ gzip:  0.05 kB
.svelte-kit/output/client/_app/immutable/chunks/DsnmJJEf.js        0.07 kB │ gzip:  0.08 kB
.svelte-kit/output/client/_app/immutable/entry/start.iLCRZqQB.js   0.08 kB │ gzip:  0.09 kB
.svelte-kit/output/client/_app/immutable/nodes/2.Bc5uTrdH.js       0.32 kB │ gzip:  0.24 kB
.svelte-kit/output/client/_app/immutable/chunks/CqHW6ZLX.js        0.74 kB │ gzip:  0.47 kB
.svelte-kit/output/client/_app/immutable/nodes/1.Biv2SF0f.js       1.01 kB │ gzip:  0.59 kB
.svelte-kit/output/client/_app/immutable/nodes/0.B-sTQ74C.js       2.73 kB │ gzip:  1.19 kB
.svelte-kit/output/client/_app/immutable/chunks/j99YIqQk.js        3.78 kB │ gzip:  2.01 kB
.svelte-kit/output/client/_app/immutable/entry/app.D14PAJbh.js     7.30 kB │ gzip:  3.47 kB
.svelte-kit/output/client/_app/immutable/chunks/DNHTCZ5S.js       20.35 kB │ gzip:  8.19 kB
.svelte-kit/output/client/_app/immutable/chunks/BSTMg8TK.js       31.91 kB │ gzip: 12.62 kB
✓ built in 249ms
.svelte-kit/output/server/.vite/manifest.json                  2.96 kB
.svelte-kit/output/server/chunks/false.js                      0.05 kB
.svelte-kit/output/server/entries/pages/_page.svelte.js        0.22 kB
.svelte-kit/output/server/internal.js                          0.33 kB
.svelte-kit/output/server/chunks/escaping.js                   0.53 kB
.svelte-kit/output/server/chunks/environment.js                0.58 kB
.svelte-kit/output/server/chunks/utils.js                      1.15 kB
.svelte-kit/output/server/chunks/equality.js                   1.23 kB
.svelte-kit/output/server/entries/fallbacks/error.svelte.js    1.34 kB
.svelte-kit/output/server/entries/pages/_layout.svelte.js      2.88 kB
.svelte-kit/output/server/chunks/index.js                      5.15 kB
.svelte-kit/output/server/chunks/exports.js                    6.87 kB
.svelte-kit/output/server/remote-entry.js                     11.33 kB
.svelte-kit/output/server/chunks/shared.js                    16.46 kB
.svelte-kit/output/server/chunks/internal.js                  59.29 kB
.svelte-kit/output/server/index.js                           140.63 kB
✓ built in 946ms

Run npm run preview to preview your production build locally.

> Using @sveltejs/adapter-auto
  Could not detect a supported production environment. See https://svelte.dev/docs/kit/adapters to learn how to configure your app to run on the platform of your choosing
  ✔ done

System Info

FWIW this is WSL2 running on Windows 11 Pro  

System:
    OS: Linux 5.15 Ubuntu 24.04.3 LTS 24.04.3 LTS (Noble Numbat)
    CPU: (32) x64 13th Gen Intel(R) Core(TM) i9-13900K
    Memory: 4.36 GB / 15.62 GB
    Container: Yes
    Shell: 5.9 - /usr/bin/zsh
  Binaries:
    Node: 22.18.0 - ~/.nvm/versions/node/v22.18.0/bin/node
    npm: 10.9.3 - ~/.nvm/versions/node/v22.18.0/bin/npm
    pnpm: 10.14.0 - ~/.local/share/pnpm/pnpm
  npmPackages:
    @sveltejs/adapter-auto: ^6.1.0 => 6.1.0
    @sveltejs/kit: ^2.37.0 => 2.37.0
    @sveltejs/vite-plugin-svelte: ^6.1.4 => 6.1.4
    svelte: ^5.38.6 => 5.38.6
    vite: ^7.1.4 => 7.1.4

Severity

serious, but I can work around it

Additional Information

Trying to debug the get_adapter function in the package but can't get my console.log() calls to show in the runtime log even when running Vite with the debug log -d option. I can look further into this if there's any advice so I can see my logs.

[Conduitry]

Could not detect a supported production environment. is a separate error. It happens when none of the environments in https://github.com/sveltejs/kit/blob/main/packages/adapter-auto/adapters.js are detected. This is separate from the check added in #14163 that uses Deno to install your dependencies when a deno.lock file is detected.