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• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I havesearched for related issues and found none that matched my issue.
• I haveread the FAQ and my problem is not listed.

Relevant Package

eslint-plugin

Playground Link

No response

Repro Code

// not applicable

ESLint Config

module.exports={parser:"@typescript-eslint/parser",rules:{},};

tsconfig

{"compilerOptions": {"allowArbitraryExtensions":true,  }}

Expected Result

I expectedisDefinitionFile to returntrue for file names like.d.css.ts (or the more general form of{file basename}.d.{extension}.ts) whenallowArbitraryExtensions is enabled.

Actual Result

The utility function doesn't seem to considerallowArbitraryExtensions.

Additional Info

This is a follow-up to the discussion in#10714 (comment).

TypeScript v5.0 addedsupport forallowArbitraryExtensions. This seems to affect several rules that use theisDefinitionFile utility:

• no-empty-interface
• no-namespace
• no-shadow
• no-unused-vars
• no-useless-empty-export

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