Fix miniflare sourcemap warnings caused by references to files outside the package boundary

[dario-piotrowicz]

Fixes #13555

miniflare's bundled sourcemap contained sources entries pointing into node_modules dependencies (zod, capnp-es, chokidar, etc.), which produced dozens of warnings in pnpm monorepos when tools like Vite or Vitest validated the sourcemaps at runtime. The build now inlines sourcesContent and patches any null entries left by upstream dependencies that don't publish their original source files

Warning

This solution significantly increase the Miniflare sourcemap file's size from 1.8MB to 6.0MB (bringing the total dist size from 10.9MB to ~15MB).
I think this is ok especially since Miniflare is a dev-dependency not used in production systems, but do let me know what you think.

This PR also fixes these types of warnings that we get in tests: https://github.com/cloudflare/workers-sdk/actions/runs/24677650006/job/72165992447?pr=13605#step:8:474

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: self explanatory DX improvement

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commit: 3cebe84

[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.

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[petebacondarwin]

I've wanted this for so long!

[workers-devprod]

Codeowners reviews satisfied

[petebacondarwin]

Could this approach fix these warnings too?

https://github.com/cloudflare/workers-sdk/actions/runs/24695116317/job/72284429437?pr=13613#step:7:947

[dario-piotrowicz]

Could this approach fix these warnings too?

https://github.com/cloudflare/workers-sdk/actions/runs/24695116317/job/72284429437?pr=13613#step:7:947

Yes it does! 🙂

[dario-piotrowicz]

Oh... I thought this PR would be much more controversial... thanks for the approval + merge @petebacondarwin 🫶