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openspec/archive/2026-04-24-enterprise-events-otel/tasks.md

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+# Tasks: enterprise-events-otel
+
+- **Change ID**: enterprise-events-otel
+- **Package**: `@suaveplan/events-otel`
+- **Date**: 2026-04-24
+
+## Prerequisites (must be published to Verdaccio first)
+
+- [x] `@suaveplan/events`
+- [x] `@suaveplan/error`
+- [x] `@suaveplan/types`
+
+## Tasks
+
+### 1. Scaffold package
+
+- [x] Create `universal/events/events-otel/` directory tree per file layout in `proposal.md`
+- [x] Write `package.json` (name `@suaveplan/events-otel`, version `0.1.0`, `sideEffects: false`, correct workspace deps and `@opentelemetry/api` catalog dep)
+- [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 `EventsOtelErrorCode` union type
+- [x] Call `defineCodes` to register all `EVENTS_OTEL.*` codes
+- [x] Export `registerEventsOtelErrorCodes()` and `EventsOtelError`
+
+### 3. Span attribute constants (`src/constants/index.ts`)
+
+- [x] Export `SPAN_ATTRIBUTES` and `SPAN_NAMES` as `as const` objects
+
+### 4. Sampling rule (`src/sampling/sampling-rule/`)
+
+- [x] Implement `SamplingRule` type union and decision function
+- [x] Write `.md`, `.types.ts`, `.test.ts`, `index.ts`
+
+### 5. Trace context propagation (`src/propagation/trace-context/`)
+
+- [x] Implement `serializeTraceContext()` using `@opentelemetry/api` W3C propagator
+- [x] Implement `deserializeTraceContext(headers)` restoring context
+- [x] Write `.md`, `.test.ts`, `index.ts`
+
+### 6. Core `attachEventTracing` (`src/core/attach-event-tracing/`)
+
+- [x] Implement `attachEventTracing(bus, options?)` via `@suaveplan/events` interceptor API only
+- [x] Create `events.dispatch` span per dispatch; run listeners within that context
+- [x] Create `events.listener` child span per listener invocation
+- [x] Set `span.status = ERROR` and call `span.recordException(err)` on listener throw
+- [x] Apply `SamplingRule` — check parent sampling decision first
+- [x] Return `EventTracingHandle` with `detach()`
+- [x] Write `.md`, `.types.ts`, `.test.ts`, `index.ts`
+
+### 7. Tests
+
+- [x] Unit tests co-located (100% coverage target)
+- [x] `tests/integration.test.ts` — attach to real EventBus with in-memory OTel SDK, dispatch events, assert span tree structure and attributes
+- [x] `tests/property.test.ts` — fast-check properties per `proposal.md` §5
+
+### 8. Docs
+
+- [x] Every `.ts` implementation file has a sibling `.md`
+- [x] Root `README.md`
+
+### 9. Pre-publish gate
+
+- [x] `bunx turbo lint typecheck test --filter=@suaveplan/events-otel` green
+- [x] `bunx turbo test:coverage --filter=@suaveplan/events-otel` ≥ 100% on touched modules
+
+### 10. Publish
+
+- [x] `bun scripts/publish.ts --package @suaveplan/events-otel`
+
+### 11. Archive
+
+- [x] Fold spec delta into `openspec/specs/events/spec.md`
+- [x] `mv openspec/changes/enterprise-events-otel openspec/archive/2026-04-24-enterprise-events-otel`