# Tasks: enterprise-queue

- **Change ID**: enterprise-queue
- **Package**: `@suaveplan/queue`
- **Date**: 2026-04-24

## Prerequisites (must be published to Verdaccio first)

- [x] `@suaveplan/error`
- [x] `@suaveplan/types`
- [x] `@suaveplan/events`

## Tasks

### 1. Scaffold package

- [x] Create `universal/streams/queue/` directory tree per file layout in `proposal.md`
- [x] Write `package.json` (name `@suaveplan/queue`, version `0.1.0`, `sideEffects: false`, correct workspace deps)
- [x] Write `tsconfig.json` extending `@suaveplan/typescript-config/library.json`
- [x] Write `vitest.config.ts` using `createTestConfig()` from `@suaveplan/testing/config`

### 2. Error codes (`src/error-codes.ts`)

- [x] Define `QueueErrorCode` union type
- [x] Call `defineCodes` to register all `QUEUE.*` codes
- [x] Export `registerQueueErrorCodes()` and `QueueError`

### 3. Types (`src/types/common.ts`)

- [x] Define and export `Queue<T>`, `Job<T>`, `JobState`, `QueueWorker`, `QueueWorkerOptions`, `RetryPolicy`, `WorkerStats`
- [x] Write `common.md`

### 4. Queue implementations

- [x] `createMemoryQueue<T>` in `src/queues/memory-queue/` — FIFO with `maxSize` bound, injectable clock/idGenerator/bus
- [x] `createPriorityQueue<T>` in `src/queues/priority-queue/` — max-heap by `job.priority`
- [x] `createDelayedQueue<T>` in `src/queues/delayed-queue/` — delayed dequeue based on `job.scheduledAt` with injectable clock
- [x] Each: `.ts`, `.md`, `.types.ts`, `.test.ts`, `index.ts`; Zod options schema; lifecycle events on bus

### 5. Retry policy helpers (`src/utils/retry-policy.ts`)

- [x] Implement constant, linear, exponential backoff delay computation
- [x] Write `.md` and `.test.ts`

### 6. QueueWorker (`src/worker/queue-worker/`)

- [x] Implement `createQueueWorker<T>` with:
  - Configurable `concurrency` (semaphore-based)
  - `AbortSignal` propagation to handler
  - Retry loop per `RetryPolicy` on handler failure
  - Dead letter queue routing after `maxRetries` exhausted
  - `WorkerStats` accumulation
  - Job lifecycle event emission via `@suaveplan/events` bus
  - OTel spans, counters, histogram per `proposal.md` §3
- [x] Write `.md`, `.types.ts`, `.test.ts`, `index.ts`

### 7. Tests

- [x] Unit tests co-located (100% coverage target)
- [x] `tests/integration.test.ts` — enqueue jobs, start worker, assert completion stats and events
- [x] `tests/property.test.ts` — fast-check properties per `proposal.md` §4

### 8. Benchmarks (`src/__benchmarks__/queue.bench.ts`)

- [x] Implement benchmark cases per `proposal.md` §5

### 9. Docs

- [x] Every `.ts` implementation file has a sibling `.md`
- [x] Root `README.md`

### 10. Pre-publish gate

- [x] `bunx turbo lint typecheck test --filter=@suaveplan/queue` green
- [x] `bunx turbo test:coverage --filter=@suaveplan/queue` ≥ 100% on touched modules

### 11. Publish

- [x] `bun scripts/publish.ts --package @suaveplan/queue`

### 12. Archive

- [x] Fold spec delta into `openspec/specs/streams/spec.md`
- [x] `mv openspec/changes/enterprise-queue openspec/archive/2026-04-24-enterprise-queue`