Optimistic Rollup of Fixes

[smorimoto]

This PR bundles various improvements and fixes accumulated across the project:

Configuration & Compatibility

• TypeScript 7 compatibility: Remove baseUrl from Ember, Nuxt, Remix, and Docusaurus configurations, and update documentation to recommend paths instead
• Major update to recommended.json: Modernize with current TypeScript best practices, add _version field

Tooling & Infrastructure

• GitHub Actions upgrades: Update to checkout@v6, setup-node@v6, and setup-deno@v2
• Test suite migration: Switch from pnpm to npm for simpler CI setup
• Deno modernization: Add deno.json with JSR imports, update build scripts to Deno 2 APIs (Deno.Command, @std/jsonc, @std/semver, etc.)

All changes maintain backwards compatibility for end users, except recommended.json!

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Closes #324
Closes #323

[smorimoto]

@orta I sincerely apologise for the unusually large size of this pull request, but I would really appreciate it if you could review it. I am constantly helped by this repository, so I wanted to resolve all the problems in one go.

[smorimoto]

Gentle ping

[orta]

Yeah, sorry, I'm not really into the idea of having to deal with this entire thing being re-written and I/we have to maintain it TBH

It's not like this codebase is actively in my head, it's solidly plodding along shipping updates to the json files as they come along

[smorimoto]

If you don’t have much time to maintain it, I can help!

[jakebailey]

Most of the changes here are just formatting changes, and the renames to jsonc aren't correct (that's not a file extension that TS accepts for configs).

I'm not sure it's worth the churn. I would probably just send the baseUrl fixes separately, the deno upgrades separately, etc.

[smorimoto]

Thanks for the feedback. I've significantly trimmed down this PR to minimise the diff — the formatting changes, .editorconfig addition, and .jsonc renames have all been removed. The remaining changes are now limited to:

• baseUrl removal for TypeScript 7 compatibility
• Deno v2 migration (deno.json, updated imports and APIs)
• CI updates (GitHub Actions versions, pnpm → npm)
• recommended.json refresh with _version field

Happy to split these into separate PRs if that would be easier to review.

[jakebailey]

Split would be better. This still seems like a smattering of unrelated fixes/changes. It's not clear to me why you've changed the package manager used in this repo at all, either.