ESLint v9 config type error

[hyunbinseo]

Describe the bug

• feat: upgrade eslint in create-svelte to v9 #12089

Type '({ readonly rules: Readonly<RulesRecord>; } | { plugins: { readonly svelte: Plugin; }; files?: undefined; languageOptions?: undefined; rules?: undefined; processor?: undefined; } | ... 4 more ... | Config)[]' is not assignable to type 'FlatConfig<RulesRecord>[]'.
  Type '{ readonly rules: Readonly<RulesRecord>; } | { plugins: { readonly svelte: Plugin; }; files?: undefined; languageOptions?: undefined; rules?: undefined; processor?: undefined; } | ... 4 more ... | Config' is not assignable to type 'FlatConfig<RulesRecord>'.
    Type '{ files: string[]; languageOptions: { parser: any; }; rules: { 'no-inner-declarations': string; 'no-self-assign': string; 'svelte/comment-directive': string; 'svelte/system': string; }; processor: string; plugins?: undefined; }' is not assignable to type 'FlatConfig<RulesRecord>'.
      The types of 'rules['svelte/comment-directive']' are incompatible between these types.
        Type 'string' is not assignable to type 'RuleEntry<SvelteCommentDirective> | undefined'.ts(2322)

Reproduction

pnpm create svelte@latest

# create-svelte version 6.1.0
# 
# ┌  Welcome to SvelteKit!
# │
# ◇  Where should we create your project?
# │  - create-svelte@6.1.0
# │
# ◇  Which Svelte app template?
# │  - Skeleton project
# │
# ◇  Add type checking with TypeScript?
# │  - Yes, using TypeScript syntax
# │
# ◇  Select additional options (use arrow keys/space bar)
# │  - Add ESLint for code linting, Add Prettier for code formatting
# │
# └  Your project is ready!

Logs

No response

System Info

System:
  OS: macOS 14.4.1
  CPU: (10) arm64 Apple M1 Pro
  Memory: 178.81 MB / 16.00 GB
  Shell: 5.9 - /bin/zsh
Binaries:
  Node: 20.12.2 - ~/.volta/tools/image/node/20.12.2/bin/node
  npm: 10.5.0 - ~/.volta/tools/image/node/20.12.2/bin/npm
  pnpm: 8.15.6 - ~/.volta/bin/pnpm
Browsers:
  Chrome: 123.0.6312.122
  Edge: 123.0.2420.81
  Safari: 17.4.1
npmPackages:
  @sveltejs/adapter-auto: ^3.0.0 => 3.2.0 
  @sveltejs/kit: ^2.0.0 => 2.5.5 
  @sveltejs/vite-plugin-svelte: ^3.0.0 => 3.1.0 
  svelte: ^4.2.7 => 4.2.13 
  vite: ^5.0.3 => 5.2.8

Severity

blocking an upgrade

Additional Information

No response

[benmccann]

This seems like something that would have to be fixed on the eslint side. It's probably best to file an issue there about it