svelte-package doesn't include source maps

[DetachHead]

Describe the bug

when running svelte-package, it does not include source maps even when they are enabled in svelte.config.js

Reproduction

// svelte.config.js
import preprocess from 'svelte-preprocess';

const config = {
  compilerOptions: {
    enableSourcemap: true,
  },
  preprocess: preprocess({
    sourceMap: true,
  }),
};

export default config;

Logs

No response

System Info

System:
    OS: Windows 10 10.0.19044
    CPU: (12) x64 11th Gen Intel(R) Core(TM) i5-11500T @ 1.50GHz
    Memory: 672.74 MB / 15.73 GB
  Binaries:
    Node: 18.10.0 - C:\Program Files\nodejs\node.EXE
    npm: 8.19.2 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.19041.1266.0), Chromium (105.0.1343.33)
    Internet Explorer: 11.0.19041.1566

Severity

annoyance

Additional Information

the src and the package created by svelte-package:

[dummdidumm]

As pointed out in my comment in #11527 I'm not sure how/if we should move forward with this. Most people don't publish their sources, yet source maps are enabled by default, so you would get broken references all over the place. Furthermore, one big source of preprocessing within Svelte files is gone with Svelte 5, as it now understands TS types natively.