Reduce @openuidev/react-ui package size while preserving source maps

[zahlekhan]

Problem

The published @openuidev/react-ui@0.13.0 package is larger than necessary because its package contents include:

• source maps for Storybook stories, tests, test helpers, and package build scripts
• repeated TypeScript source embedded as sourcesContent in generated maps
• source maps that reference TypeScript files which are not present in the published package

This creates package-size overhead while providing inconsistent source-level debugging.

Expected outcome

• Keep external JavaScript and declaration source maps for debugging and editor navigation.
• Avoid embedding repeated source content in every map.
• Publish each referenced production TypeScript file once.
• Exclude stories, tests, test helpers, and build scripts from the package.
• Preserve existing runtime JavaScript, CSS, exports, and dependency behavior.

Measured impact

Measured with npm pack --dry-run --json:

Metric	Published 0.13.0	Optimized build	Improvement
Tarball	2,471,762 bytes	1,681,784 bytes	789,978 bytes smaller (32.0%)
Unpacked	13,366,704 bytes	9,471,011 bytes	3,895,693 bytes smaller (29.1%)
Source maps	1,107	973	134 fewer (12.1%)

The optimized artifact retains all production source maps with zero embedded sourcesContent and no development-only artifacts.

Proposed implementation

• Set Rolldown's supported outputOptions.sourcemapExcludeSources option through tsdown.
• Use a production TypeScript build configuration that excludes development-only inputs.
• Include referenced production TypeScript under src/ through the npm package allowlist.

Compatibility considerations

• Source maps are no longer self-contained. Debuggers can resolve the TypeScript shipped in the package, but error-monitoring workflows that upload only dist/*.map may also need to upload src/ or use repository source integration.
• Production TypeScript source becomes present in installed packages, which may affect tools that scan or watch node_modules.
• Unsupported deep imports into stories, tests, helpers, or build scripts will no longer resolve; none of those paths are part of the public package exports.

Related pull request

• Optimize React UI source map packaging #842