Register bun.lock as JSON

[RiskyMH]

Description

Bun recently added a text lockfile called bun.lock (https://bun.sh/blog/bun-lock-text-lockfile) and it will soon become default.

It is also expected to only have one bun.lock file at root. At time of writing there was at least 200 repos (and still quickly growing), but it seems like github search count randomly fluctuates +/- around ~30 results.

Checklist:

• I am adding a new extension to a language.
  • The new extension is used in hundreds of repositories on GitHub.com
    • Search results for each extension:
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*bun.lock
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • https://github.com/oven-sh/bun/blob/main/packages/bun-vscode/example/bun.lock
    • Sample license(s): MIT
  • I have included a change to the heuristics to distinguish my language from others using the same extension.

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Although bun.lock officially uses JSONC, this PR sets it to standard JSON. Bun only relies on the trailing comma feature, which JSON happens to support without errors. The main reason to use standard JSON is that it provides better syntax highlighting on GitHub (#6197)

[RiskyMH]

Hi @lildude, thanks for reviewing this PR 🙏.

GitHub search seems to be inconsistent with the result count—it’s fluctuated a lot recently. From what I can tell, there are at least 220 repositories using bun.lock, which meets the minimum requirements. Each repo typically has only one lockfile, even in monorepo setups with bun.lock at the root.

The fluctuations seem to be a search or caching issue rather than a decline in usage. Adoption is expected to grow significantly soon, as bun.lock will become the default for new projects in Bun 1.2. However we would love it if JSON highlighting could be default by then!

ignore above, it appears to have calmed down and show 200+ repos consistently.

--

The search is currently showing the correct number again, so I’d appreciate it if you could take another look:
https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*bun.lock+lockfileVersion+NOT+org%3Aoven-sh

Thank you! 🙌