Bug eslint `--cache` broken if using `kit.typescript.config` in `svelte.config.js`

[rebasecase]

Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.

What version of ESLint are you using?

9.32.0

What version of eslint-plugin-svelte are you using?

6.1.1

What did you do?

Using this https://svelte.dev/docs/kit/configuration#typescript

Breaks eslint with --cache because functions can't be serialized.

https://stackblitz.com/edit/sveltejs-kit-template-default-uaahfr9a?file=eslint.config.js

What did you expect to happen?

To work fine

What actually happened?

Oops! Something went wrong! 🙁

ESLint: 9.32.0

The requested operation requires ESLint to serialize configuration data,
but the configuration key "typescript.config" contains a function value,
which cannot be serialized.

Please double-check your configuration for errors.
This feature breaks eslint

Link to GitHub Repo with Minimal Reproducible Example

https://stackblitz.com/edit/sveltejs-kit-template-default-uaahfr9a?file=svelte.config.js

Additional comments

This is the default config from https://svelte.dev/docs/cli/eslint

[rebasecase]

What I think is needed is svelte to generate a serializable version of svelte.config, which can be included in the eslint config?

[rebasecase]

Since there's no public api for this I tried this..

function generateSvelteConfig() {
  // Find base tsconfig.json
  const tsConfigPath = fileURLToPath(new URL('./tsconfig.json', import.meta.url));
  const baseConfigJson = typescript.readConfigFile(tsConfigPath, typescript.sys.readFile).config;

  // Expand "extends" and normalize paths
  const parsedConfig = typescript.parseJsonConfigFileContent(
    baseConfigJson,
    typescript.sys,
    process.cwd()
  );

  let tsConfigJson = parsedConfig.raw || baseConfigJson;

  // // Run the SvelteKit typescript.config hook if present
  if (typeof svelteConfig?.kit?.typescript?.config === 'function') {
    const retVal = svelteConfig.kit.typescript.config(tsConfigJson);
    if (retVal && typeof retVal === 'object') {
      tsConfigJson = retVal;
    }
  }

  // Create a serializable version of svelteConfig for ESLint caching
  // We need to execute the typescript.config function if it exists
  const finalSvelteConfig = {
    ...svelteConfig,
    kit: {
      ...svelteConfig.kit,
      typescript: {
        ...svelteConfig.kit.typescript,
        config: tsConfigJson
      }
    }
  };

  return finalSvelteConfig;
}

[rebasecase]

Not actually sure that's even needed, doesn't it read tsconfig anyway, so can't you delete the key?