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fix(utils): correct calculateConfigForFile return type #11451

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@Gajdascz Gajdascz commented Aug 4, 2025

PR Checklist

Overview

Changes:

  • Extend FlatESLintBase generic with FlatConfig.Config
  • Update calculateConfigForFile to return FlatConfig.Config

Notes:

The comment for calculateConfigForFile in FlatESLintBase mentions it may return undefined if no config is available, which differs from the base SharedESLintBase, which does not mention undefined.

I've preserved the comment and focused solely on aligning the return type with FlatConfig.Config. If you'd like this potential discrepancy explored or clarified further, I'm happy to look into it and follow up with additional typing or doc updates in this PR or a separate one.

- Issue: typescript-eslint#11444

Changes:
- Extend `FlatESLintBase` generic with `FlatConfig.Config`
- Update `calculateConfigForFile` to return `FlatConfig.Config`

Note:
The comment for `calculateConfigForFile` in `FlatESLintBase` mentions the return type as
"A configuration object for the file or `undefined` if there is no configuration data".
This differs from the base `SharedESLintBase`, which only states it returns the config object.

Left as-is, but may warrant clarification or further typing updates.
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Thanks for the PR, @Gajdascz!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!


🙏 Please, if you or your company is finding typescript-eslint valuable, help us sustain the project by sponsoring it transparently on https://opencollective.com/typescript-eslint.

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Bug: Incorrect return type from TSESLint.FlatESLint#calculateConfigForFile
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