🚀 Feature: Switch eslint.config.js to eslint.config.ts

[JoshuaKGoldberg]

Feature Request Checklist

• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

Now that Node.js has stable type stripping without a warning (nodejs/node#58643) and ESLint supports it natively (eslint/eslint#19357), we should be able to switch the ESLint config from .js to .ts. That'd be the last JS config file added to --preset everything switched to TS.

Additional Info

Blocked on the warning-less type stripping being released in the next minor version of Node.js.

Inspired by @michaelfaith's michaelfaith/eslint-plugin-package-json#1112.

🎁

[JoshuaKGoldberg]

Unblocked by #2230. 🚀

[karlhorky]

If the unstable_native_nodejs_ts_config flag is removed before this is implemented (and minimum Node.js is bumped to Node.js v22.18.0 or Node.js v24.3.0 (where type stripping has been unflagged and the experimental warning removed), then the implementation for this issue would be able to use zero flags:

• Change Request: Remove unstable_native_nodejs_ts_config after Node.js v22.18.0 / v24.3.0 eslint/eslint#19985

[JoshuaKGoldberg]

I'd been waiting to do this until all plugins had types - so eslint.config.ts wouldn't have any type errors or @typescript-eslint/no-unsafe-* lint reports. And now that eslint-community/eslint-plugin-eslint-comments#246 is merged, hooray! We're good to go.