Load sourcemaps relative to entry directory

[penalosa]

What this PR solves / how to test

Load sourcemaps relative to the entry directory, not cwd.

Fixes CUSTESC-40775.

Author has addressed the following

• Tests
  • TODO (before merge)
  • Included
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• Changeset (Changeset guidelines)
  • TODO (before merge)
  • Included
  • Not necessary because:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s): https://github.com/cloudflare/cloudflare-docs/pull/...
  • Not necessary because: bugfix

[changeset-bot]

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Latest commit: 50e90bc

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8928143743/npm-package-wrangler-5744

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5744/npm-package-wrangler-5744

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8928143743/npm-package-wrangler-5744 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8928143743/npm-package-create-cloudflare-5744 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8928143743/npm-package-cloudflare-kv-asset-handler-5744

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8928143743/npm-package-miniflare-5744

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8928143743/npm-package-cloudflare-pages-shared-5744

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8928143743/npm-package-cloudflare-vitest-pool-workers-5744

Note that these links will no longer work once the GitHub Actions artifact expires.

---

wrangler@3.53.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240419.0
workerd	1.20240419.0	1.20240419.0
workerd --version	1.20240419.0	2024-04-19

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

[petebacondarwin]

LGTM!

[zebp]

Can this test explicitly specify the file field of this? It's critical that it matches the name of a file in the multipart but has .map otherwise the stacktrace remapper in the runtime can't correlate module names to sourcemaps.

[zebp]

(not that I think this PR would chance that field, but we should have been explicitly testing this in the first place)