`eslint-typegen` types are not compatible with ESLint types

[G-Rath]

Checklist

• I have tried restarting my IDE and the issue persists.
• I have read the FAQ and my problem is not listed.

Tell us about your environment

• ESLint version: 9.31.0
• eslint-plugin-vue version: 10.3.0
• Vue version: -
• Node version: 20.19.0
• Operating System: Linux

Please show your full configuration:
(see reproduction repository - no special settings, just plain strict-mode typescript)

What did you do?

Updated eslint-plugin-vue

What did you expect to happen?
Everything to continue working, and for there to be no type errors

What actually happened?

Lots of type errors

Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/array-bracket-newline'' of type 'RuleEntry<VueArrayBracketNewline> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/array-bracket-spacing'' of type 'RuleEntry<VueArrayBracketSpacing> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/array-element-newline'' of type 'RuleEntry<VueArrayElementNewline> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/arrow-spacing'' of type 'RuleEntry<VueArrowSpacing> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/attribute-hyphenation'' of type 'RuleEntry<VueAttributeHyphenation> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/attributes-order'' of type 'RuleEntry<VueAttributesOrder> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/block-lang'' of type 'RuleEntry<VueBlockLang> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/block-order'' of type 'RuleEntry<VueBlockOrder> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/block-spacing'' of type 'RuleEntry<VueBlockSpacing> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/block-tag-newline'' of type 'RuleEntry<VueBlockTagNewline> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/brace-style'' of type 'RuleEntry<VueBraceStyle> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/camelcase'' of type 'RuleEntry<VueCamelcase> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
Error: node_modules/eslint/lib/types/index.d.ts(1374,3): error TS2411: Property ''vue/comma-dangle'' of type 'RuleEntry<VueCommaDangle> | undefined' is not assignable to 'string' index type 'RuleEntry<any[]>'.
...

The issue is because the original type (RulesRecord) defines an index meaning you cannot have optional properties - removing the ? from the properties resolves the issue.

See this playground showcasing the issue both when merging directly into the interface and when using extends (which results in the error being put on the original interface, masking it somewhat).

Note that in the playground you cannot reproduce the issue using ESLint itself due to how packages work in the playground.

Repository to reproduce this issue

https://github.com/G-Rath/bug-eslint-vue

1. clone repo
2. run npm ci
3. run npm run typescript

Alternatively, look at the GitHub Actions runs

[2nofa11]

It seems to be caused by extending ESLint's Linter.RulesRecord interface when generating types(here).

The eslint-typegen package has an includeAugmentation option that controls whether to extend ESLint's core types. By default, it's set to true, which causes the type conflict you're experiencing.

Setting includeAugmentation: false should resolve this issue by generating standalone type definitions instead of augmenting ESLint's built-in types.

Proposed fix:

const dts = await pluginsToRulesDTS(
  {
    vue: plugin
  },
+  {
+    includeAugmentation: false
+  }
)