Spurious prop warnings with `+page.svelte` files

Describe the bug

On each route not using a load function, the console has

[Warning] <Page> was created with unknown prop 'data' (+page.svelte, line ...)
[Warning] <Page> was created with unknown prop 'errors' (+page.svelte, line ...)

These can be removed with the boilerplate

export let data;
export let errors;

in the +page.svelte files for those routes, but ideally the warnings would not be present unless the route has an associated load function.

Reproduction

Launch a SvelteKit app that includes routes which do not explicitly accept data or errors and check the console.

Logs

No response

System Info

System:
    OS: macOS 12.5
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 25.14 MB / 16.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 18.4.0 - ~/Library/pnpm/node
    npm: 8.12.1 - ~/Library/pnpm/npm
  Browsers:
    Safari: 15.6
  npmPackages:
    @sveltejs/adapter-static: 1.0.0-next.38 => 1.0.0-next.38 
    @sveltejs/kit: next => 1.0.0-next.411 
    svelte: ^3.49.0 => 3.49.0 
    vite: ^3.0.8 => 3.0.8

Severity

annoyance

Additional Information

No response

[kevinrenskers]

This got closed a while back but I am still seeing frequent <Page> was created with unknown prop 'errors' warnings for pages without a load function.

[dummdidumm]

This comes from a warning in Svelte core, which we IMHO could just remove. I also believe there is some (closed?) issue in this repo already noticing the same thing in a different context.