Infer upload_source_maps setting in the output Worker config from the build.sourcemap setting in the Vite config

[jamesopstad]

Fixes #11963

Infer upload_source_maps setting in the output Worker config from the build.sourcemap setting in the Vite config.

If build.sourcemap is enabled for a Worker environment, as in the following example, "upload_source_maps": true will now automatically be added to the output wrangler.json file.
This removes the need to additionally specify the upload_source_maps property in the input Worker config.

export default defineConfig({
	environments: {
		my_worker: {
			build: {
				sourcemap: true,
			},
		},
	},
	plugins: [cloudflare()],
});

Note that if upload_source_maps is set in the input Worker config, this value will take precedence.
This makes it possible to generate source maps without uploading them.

---

• 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): Add note about upload_source_maps inference in Vite plugin cloudflare-docs#28146
  • Documentation not necessary because:

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

---

[changeset-bot]

🦋 Changeset detected

Latest commit: 188c9cb

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

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[claude]

Claude finished @jamesopstad's task —— View job

---

Changeset Review

✅ All changesets look good

The changeset in .changeset/tender-views-think.md meets all requirements:

1. Version Type: minor is correct - this adds a new automatic configuration feature
2. Changelog Quality: Clear description with a helpful code example showing how the feature works
3. Markdown Headers: No problematic h1/h2/h3 headers used
4. Analytics: Not applicable - no analytics collection changes
5. Experimental features: Not applicable - this is a stable feature addition

The changeset has a clear title, explains what the feature does, provides a usage example, and notes the precedence behavior when upload_source_maps is explicitly set.

---

[pkg-pr-new]

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wrangler

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commit: 188c9cb

[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 3 additional findings.

[vicb]

just a FYI that this could be simplified

Suggested change

	path.join(rootDir, "dist", "worker", "wrangler.json"),
	path.join(rootDir, "dist/worker/wrangler.json"),

[vicb]

LGTM, 2 nits