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feat: introduce tsdown, support mixed js & ts in codebase #2916

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@9romise 9romise commented Aug 22, 2025

Hi 👋, Vue team!

I've been trying to contribute to eslint-plugin-vue and recently noticed there might be plans to rewrite it in TypeScript, though things seem to have stalled. I’d like to help move this effort forward.

This PR introduces tsdown, a tool that can gradually transform mixed JavaScript/TypeScript codebases into pure JavaScript output. This allows us to incrementally migrate the entire project to TypeScript. I’ve already successfully rewritten several files — it works well.

Going forward, I can split the changes into multiple PRs to make review easier.

If there’s anything you’d like me to adjust in this PR, or if you have any feedback, I’d really appreciate your thoughts! 💚

Related: #2777

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Latest commit: f1c5923

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@9romise 9romise changed the title feat: introduce tsdown, support js & ts feat: introduce tsdown, support mixed js & ts in codebase Aug 22, 2025
@9romise 9romise marked this pull request as draft August 22, 2025 02:24
@9romise 9romise marked this pull request as ready for review August 22, 2025 02:47
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Really nice, thank you!

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9romise commented Aug 25, 2025

Updated.

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9romise commented Aug 25, 2025

I'll fix the CI later.

@9romise 9romise marked this pull request as draft August 25, 2025 10:57
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