---
id: build-and-exports-validation
name: Validate build, package.json exports, and tsup config for all adapters
status: completed
depends_on: []
scope: narrow
risk: low
impact: component
level: implementation
---

## Description

Verify that the build pipeline correctly produces dual ESM + CJS output with declarations for all entry points, and that `package.json` exports map and `tsup.config.ts` entries are consistent.

Currently only `src/index.ts` and `src/event-target-redis.ts` are entry points. As new adapters are added, each needs:
1. An entry in `tsup.config.ts` entry array
2. A sub-path export in `package.json` exports map (ESM + CJS + declarations)
3. A barrel re-export in `src/index.ts`

This task validates the current setup and serves as a checklist item for each adapter task. It can be done early and re-verified as adapters are added.

## Acceptance Criteria

- [ ] `npm run build` produces correct output for existing entry points (index, event-target-redis)
- [ ] `npm run lint` (tsc --noEmit) passes
- [ ] `package.json` exports map has correct ESM/CJS/dts paths for each entry point
- [ ] `tsup.config.ts` lists all current entry points
- [ ] `src/index.ts` re-exports everything from all modules
- [ ] Peer dependencies and peerDependenciesMeta are correct
- [ ] No runtime dependencies (Repeater is inlined)

## References

- docs/architecture/build-distribution.md
- package.json
- tsup.config.ts

## Notes

Validated all acceptance criteria. No changes were needed — the existing configuration is correct.

### Validation Results

1. **`npm run build` produces correct output** ✅
   - `src/index.ts` → `dist/index.js` (ESM), `dist/index.cjs` (CJS), `dist/index.d.ts` + `dist/index.d.cts` (declarations)
   - `src/event-target-redis.ts` → `dist/event-target-redis.js` (ESM), `dist/event-target-redis.cjs` (CJS), `dist/event-target-redis.d.ts` + `dist/event-target-redis.d.cts` (declarations)
   - Code splitting enabled: shared chunk between entries
   - Verified both ESM dynamic import and CJS require work for both entry points

2. **`npm run lint` (tsc --noEmit) passes** ✅
3. **`package.json` exports map has correct ESM/CJS/dts paths** ✅
4. **`tsup.config.ts` lists all current entry points** ✅
5. **`src/index.ts` re-exports everything from all modules** ✅
6. **Peer dependencies and peerDependenciesMeta are correct** ✅
7. **No runtime dependencies** ✅

### Verified type resolution
- Sub-path and barrel imports resolve correctly with tsc
- Works with both skipLibCheck true and false

### Verified package contents
- `npm pack --dry-run` shows 19 files (all dist files + package.json)

## Summary

Validated build pipeline, package.json exports map, and tsup config for all adapters. All acceptance criteria pass with no changes required.
- Created: none
- Modified: tasks/016-build-and-exports-validation.md (status update only)
- Tests: 0 (no test files exist yet)