feat(rollup-plugin): enable sourcemap output for css modules

[joshblack]

Thought it would be nice to have sourcemaps work all the way through to production so I updated our rollup plugin to emit sourcemaps 👀

Sourcemaps are generated as files that are siblings to generated *.css files. The sourceMappingURL should be only a name pointing to the *.css.map file of the same name in the same directory as the generated *.css file.

Changelog

New

• Add support for sourcemaps to our rollup plugin

Changed

Removed

Rollout strategy

• Minor release

Testing & Reviewing

• Run build
• Verify that CSS generated as expected (blankslate is a good example)
• Verify that sourcemap generated as expected
• Verify that the sourceMappingURL between CSS and sourcemap is correct

Alternatively, you can use the app router example to test out that sourcemaps are generated correctly

[changeset-bot]

🦋 Changeset detected

Latest commit: 6dd040a

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

This PR includes changesets to release 1 package

Name	Type
@primer/react	Minor

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	96.33 KB (0%)
packages/react/dist/browser.umd.js	96.49 KB (0%)