Deduplicate codemod logic in C3 and autoconfig by moving it to its own @cloudflare/codemod package

[dario-piotrowicz]

Fixes partially https://jira.cfdata.org/browse/DEVX-2380

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: this PR just moves pre-existing (and test covered) code around
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: internal change

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6b1aa34

The changes in this PR will be included in the next version bump.

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[pkg-pr-new]

create-cloudflare

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@cloudflare/kv-asset-handler

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miniflare

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@cloudflare/pages-shared

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@cloudflare/vite-plugin

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@cloudflare/vitest-pool-workers

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wrangler

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commit: 6b1aa34

[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 4 additional findings.

[petebacondarwin]

I'm Bonk, and I've done a quick review of your PR.

This PR extracts shared codemod utilities into a new @cloudflare/codemod package, deduplicating code between C3 and wrangler's autoconfig. The overall structure and approach look good.

One issue found:

1. Stale/incorrect file paths in create-cloudflare/tsconfig.json (lines 7-9) — The three ../codemod/... include entries reference files that don't exist (codemod.test.ts, codemod.ts, codemodDev.ts). The actual files in the new package are named index.test.ts, index.ts, and dev.ts. Additionally, these cross-package includes are unnecessary since @cloudflare/codemod has its own tsconfig. I posted a suggestion comment to remove them.

github run

Does this need addressing @dario-piotrowicz ?

[dario-piotrowicz]

Does this need addressing @dario-piotrowicz ?

It's already been addressed 🙂

[github-actions]

⚠️ Issues found

File: .changeset/add-codemod-package.md

1. Weak title: The title "First release of new package" is not a meaningful imperative description of the change. Per the README guidelines, the title should be a single imperative sentence describing what the change is (e.g., "Add @cloudflare/codemod package with AST-based codemod utilities"). "First release of new package" tells users nothing about what the package does or why it exists.

2. Redundant structure: The changeset has a weak one-liner title followed by a body that actually contains the useful information. The title and body should together form a coherent entry — ideally the title stands on its own as a useful changelog heading, with the body providing additional detail.

Suggested fix:

---
"@cloudflare/codemod": minor
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Add `@cloudflare/codemod` package with internal AST-based codemod utilities

Introduces the `@cloudflare/codemod` package, providing AST-based codemod utilities (`parseJs`, `parseTs`, `parseFile`, `transformFile`, `mergeObjectProperties`) built on `recast`.

The minor version bump is appropriate for a new package's first release.