fix(themes): add tsup build to produce proper JS/TS module output

[cixzhang]

Problem

Theme packages (@xds/theme-default, @xds/theme-neutral, @xds/theme-brutalist) only ran xds build-theme which produces CSS and theme-named JS files (e.g. default.js, neutral.js). But package.json exports point to index.js/index.mjs/index.d.ts which didn't exist.

The v0.0.2 release manually patched package.json to point to default.js/neutral.js, but the underlying build was still broken — those files reference ./icons which doesn't exist in dist/.

Fix

Each theme package now runs both build steps:

1. xds build-theme — produces theme.css (the CSS custom properties)
2. tsup — compiles src/index.ts to proper CJS/ESM/DTS output

Changes

• Added tsup.config.ts to each theme package (default, neutral, brutalist)

  • Entry: src/index.ts
  • Formats: CJS + ESM
  • DTS generation enabled
  • clean: false to preserve theme.css from the prior build step
  • External: @xds/core, @stylexjs/stylex, react, and theme-specific icon libraries

• Updated build scripts to chain both commands and clean up stale artifacts:

  xds build-theme src/defaultTheme.ts -o dist/theme.css && tsup && rm -f dist/default.js dist/default.d.ts
  

• Fixed brutalist package.json — was pointing main/types/exports at ./src/index.ts instead of dist/ output

• Fixed exports condition ordering — types now comes before import/require (matches @xds/core convention, avoids esbuild warnings)

Output

Each theme now produces:

dist/
  index.js      # CJS
  index.mjs     # ESM
  index.d.ts    # TypeScript declarations
  index.d.mts   # TypeScript declarations (ESM)
  theme.css     # CSS custom properties

Verification

• yarn build ✅ — all packages build successfully
• yarn test ✅ — 89 test files, 1428 tests pass
• yarn lint ✅ — 0 errors (pre-existing warnings only)
• All theme dist/ directories contain the expected files
• No stale default.js/neutral.js/brutalist.js artifacts remain

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[github-actions]

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No new or modified components detected.

Bundle Size Summary

Package	Size (ESM)	Size (CJS)	Gzipped
@xds/core	9.1KB	14.7KB	2.3KB

Accessibility Audit

Status: No accessibility violations detected.

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