chore(website): configure the playground for all available file types

[reduckted]

PR Checklist

• Addresses an existing open issue: fixes Bug: playground does not work with js files #12210
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

The playground's ESLint configuration only configured .ts and .tsx files. None of the other file types were configured, so when ESLint parsed the config for a different file type it would fail to find the rules.

The ESLint configuration is now configured for all of the file extensions that can be selected.

I've also included the error message in the linter message instead of only the stack trace to make it easier to debug in the future.

[typescript-eslint]

Thanks for the PR, @reduckted!

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!

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☁️ Nx Cloud last updated this comment at 2026-04-10 12:51:30 UTC

[JoshuaKGoldberg]

Nice, I like the wiring up of existing fileTypes. This feels smooth. Thanks! ✨