[Sveltekit 2.1.0] `onNavigate` callback return type is wrong

[f-elix]

Describe the bug

Since Sveltekit 2.1.0 (specifically this PR https://github.com/sveltejs/kit/pull/11340/files#diff-9e558fcdee2759e3a180281c10a134e7caa6123e746f91178e20ec1b9d61be76R1964), the onNavigate callback return type has been updated to MaybePromise<void>, whereas it was MaybePromise<void | () => void> before. Since the docs still mention that we can return a function (or a promise that resolves to a function), I'm assuming that this type was incorrectly changed.

Reproduction

Go to https://stackblitz.com/edit/sveltejs-kit-template-default-usx2yu?description=The%20default%20SvelteKit%20template,%20generated%20with%20create-svelte&file=src%2Froutes%2F%2Blayout.svelte,package.json&title=SvelteKit%20Default%20Template

and run npm run check to view the error.

Logs

No response

System Info

System:
    OS: macOS 12.7.1
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    Memory: 40.65 MB / 32.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 20.6.0 - ~/.nvm/versions/node/v20.6.0/bin/node
    npm: 9.8.1 - ~/.nvm/versions/node/v20.6.0/bin/npm
    pnpm: 8.9.2 - ~/Library/pnpm/pnpm
    bun: 1.0.0 - ~/.nvm/versions/node/v20.6.0/bin/bun
  Browsers:
    Brave Browser: 116.1.57.53
    Chrome: 120.0.6099.199
    Safari: 17.1.2
  npmPackages:
    @sveltejs/adapter-vercel: 4.0.4 => 4.0.4 
    @sveltejs/kit: 2.1.2 => 2.1.2 
    @sveltejs/vite-plugin-svelte: 3.0.1 => 3.0.1 
    svelte: 4.2.8 => 4.2.8

Severity

annoyance

Additional Information

No response