chore: update TypeScript to v6

[sethamus]

Prerequisites checklist

• I have read the contributing guidelines.

AI acknowledgment

• I did not use AI to generate this PR.
• (If the above is not checked) I have reviewed the AI-generated content before submitting.

What is the purpose of this pull request?

This PR updates the repo’s TypeScript tooling to v6.

What changes did you make? (Give an overview)

• bump typescript to v6 in package.json.
• updated the TypeScript module settings to use moduleResolution: "nodenext" and module: "nodenext" instead of the deprecated moduleResolution: "node" setup.
• added rootDir: "lib" to eslint-visitor-keys.

Related Issues

Is there anything you'd like reviewers to focus on?

[nzakas]

Please hold off. There's already a bunch of "Update TypeScript to v6" PRs across the org and we're not even sure we want to upgrade immediately.

[sethamus]

@nzakas Sorry for the PRs! I opened these based on the discussion in my other PR (eslint/eslint#20547 (comment)), which suggested that once TypeScript 6 is officially released, we should update our tooling.

[github-actions]

Hi everyone, it looks like we lost track of this pull request. Please review and see what the next steps are. This pull request will auto-close in 7 days without an update.

[github-actions]

Hi everyone, it looks like we lost track of this pull request. Please review and see what the next steps are. This pull request will auto-close in 7 days without an update.

[nzakas]

Gotcha. @fasttime I'll leave it up to you to review.

[lumirlumir]

Just a note that there are currently some CI failures related to this update.

[fasttime]

The type tests are still failing.