workers-utils - `getLatestWorkerdCompatibilityDate`

[dario-piotrowicz]

Fixes https://jira.cfdata.org/browse/DEVX-2384

Add a new getLatestWorkerdCompatibilityDate function to the workers-utils package and use that package in wrangler, create-cloudflare and the vite plugin instead of having the two different implementations (getDevCompatibilityDate and getWorkerdCompatibilityDate).

Note: these changes get rid of the logic in getWorkerdCompatibilityDate that fetched workerd from the npm registry since that doesn't generally seem necessary/beneficial and just relying on the local version of workerd (which is always installed when the function is called) seem just faster and safer to me.

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• Tests
  • [x] Tests included/updated
  • [ ] Tests not necessary because:
• Public documentation
  • [ ] Cloudflare docs PR(s):
  • [x] Documentation not necessary because: we don't currently document the workers-utils package
• Wrangler V3 Backport
  • [ ] Wrangler PR:
  • [x] Not necessary because: not just a Wrangler change

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: c5d7016b01ea6acc10650ac44fdc2dd42e7bdaad

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[dario-piotrowicz]

See the inline comment for my concerns.

Would it make sense to:

1. Refactor/move the code in a first PR (same API, same behavior)
2. Change the behavior in a follow up PR only if we are certain there is no unwanted side effects

Once the function has been created/moved to workers-utils updating it would in theory be a breaking change (even though the package is still at 0.x so possibly not a huge deal), so I think it'd be ideal to just move it there once with the final implementation.

If your concern is C3 I can just leave C3 alone and just use the function is autoconfig (that wouldn't change any behavior at all). Although I'd still like to understand the C3 concern... because I fail to see downsides of this approach...

[claude[bot]]

Claude finished @dario-piotrowicz's task —— View job

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Changeset Review

Reviewing changeset files for compliance with repository guidelines...

Tasks

• [x] Read changeset guidelines
• [x] Review .changeset/chubby-tigers-read.md
• [x] Review .changeset/shaky-crews-brush.md
• [x] Validate version types and changelog quality
• [x] Check for cute animal image

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✅ All changesets look good

Both changeset files follow the repository guidelines:

• Version types: Both use minor which is appropriate for new features/utilities
• No forbidden major versions: No major version bumps for wrangler
• Markdown headers: No h1/h2/h3 headers present
• Descriptions: Clear, concise titles describing the new utilities being exposed

Changeset Details:

1. chubby-tigers-read.md: Exposes getLocalWorkerdCompatibilityDate utility in workers-utils and vite-plugin
2. shaky-crews-brush.md: Exposes isCompatDate utility in workers-utils

Both are appropriately marked as minor since they expose new public APIs.

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Cute Animal Report: This appears to be Claude Code's loading spinner (an orange dot). Not technically a cute animal, but it gets a solid 10/10 for faithfully indicating work in progress and being perfectly circular. Would spin again.

[pkg-pr-new[bot]]

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@cloudflare/workers-editor-shared

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@cloudflare/workers-utils

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wrangler

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commit: c5d7016

[dario-piotrowicz]

Merging just not to leave this one hanging, we can always improve things later if we want 🙂