# Scaffolding a feature

`turbo gen feature` produces a Lazar-conformant feature package under
`packages/<name>/` matching the shape of the reference `navigation` feature.

## Invoking the generator

Interactive (recommended for first runs — Plop will prompt for each value):

```bash
pnpm turbo gen feature
```

Non-interactive (positional bypass — order matches the prompts in
`turbo/generators/config.ts`):

```bash
pnpm turbo gen feature --args <name> <Entity> <entities-plural>
```

| Position | Prompt | Example | Conventions |
|---|---|---|---|
| `<name>` | Feature package name | `widgets` | `kebab-case`, becomes `@repo/<name>` and `packages/<name>/` |
| `<Entity>` | Entity name | `Widget` | `PascalCase` singular, drives class/symbol/use-case names |
| `<entities-plural>` | Entity plural slug | `widgets` | `kebab-case`, used for the future Payload collection slug |

Example end-to-end:

```bash
pnpm turbo gen feature --args widgets Widget widgets
pnpm install                              # link the new workspace package
pnpm --filter @repo/widgets lint typecheck test
```

## Conformance-ready by default

Since milestone v of the conformance system, `pnpm turbo gen feature <name>` emits two conformance artefacts:

- **`src/feature.manifest.ts`** declaring the scaffolded `getX` use case
- **`src/di/bind-production.ts`** with `assertFeatureConformance(...)` called at the tail

Run `pnpm conformance` after generating a feature — it should pass cleanly. If you add `bus.publish("X")` calls in a factory body, you'll also need to add `"X"` to the manifest's `publishes[]` array for that use case, or the `no-undeclared-event-publish` ESLint rule will warn.

See `docs/guides/conformance-quickref.md` for the manifest field reference.

## What it generates

- Package files: `package.json`, `tsconfig.json`, `vitest.config.ts`,
  `eslint.config.js`, `turbo.json`, `AGENTS.md`
- One entity (`src/entities/models/<entity>.ts`) with a Zod schema +
  unit test
- One use case (`src/application/use-cases/get-<entity>.use-case.ts`) with
  exported input/output schemas, factory function, and tests
- One controller (`src/interface-adapters/controllers/get-<entity>.controller.ts`)
  with the canonical safeParse → presenter shape
- Mock + real repository (`src/infrastructure/repositories/<entity>.repository{,.mock}.ts`).
  Both wrap calls in `tracer.startSpan`; the real repo also calls
  `logger.captureException` on errors. The real repo body is a Phase-1
  stub that returns `null` until you wire a Payload collection.
- DI: `symbols.ts`, `module.ts`, `container.ts`, plus
  `bind-production.ts` and `bind-dev-seed.ts` that compose
  `withSpan(tracer, opts, withCapture(logger, tags, factory(deps)))` at
  bind time (post-R44 sandwich pattern)
- tRPC integration: `procedures.ts` (feature-scoped error middleware) and
  `router.ts` exposing `get<Entity>` with full router tests including
  `BAD_REQUEST` / `NOT_FOUND` mapping
- Contract suite (`__contracts__/`), dev seed (`__seeds__/dev.ts`), and
  empty stubs for `__factories__/` and `ui/`

## Phase-1 scope (intentionally limited)

The generator does NOT yet emit:

- Payload CMS collection / global templates (`integrations/cms/**`)
- React Query option builders (`ui/query.ts`)
- Faker-driven `defineFactory<Entity>` factories (only stubs)
- Multi-entity / multi-use-case (one `get<Entity>` only)
- Aggregator wiring across the monorepo

Add these by hand once the entity stabilises. The generator's stub files
clearly mark each `TODO`.

## Manual aggregator wiring (printed on success)

After running the generator, hand-edit these files to mount the new
feature on the app's runtime composition graph:

1. **`apps/web-next/src/server/bind-production.ts`** — import
   `bindProduction<Name>` and `bindDevSeed<Name>` and call them from the
   `bindAll()` dispatcher (production branch + dev-seed branch).
2. **`packages/core-api/src/root.ts`** — import `<name>Router` from
   `@repo/<name>/api` and mount it on the app router.
3. **`packages/core-api/package.json`** — add `"@repo/<name>": "workspace:*"`
   to dependencies.
4. **`apps/web-next/package.json`** — add `"@repo/<name>": "workspace:*"`
   to dependencies.
5. **(Later) Payload CMS** — add a collection at
   `packages/<name>/src/integrations/cms/collections/<entities-plural>.ts`
   and register it in `packages/core-cms/...`.
6. **Verify**: `pnpm --filter @repo/<name> lint typecheck test`

The same checklist is printed by the generator when it finishes.

## Adding events and jobs to a feature

Once a feature exists, augment it with cross-feature events or background jobs using the dedicated generators. See [`docs/guides/events-and-jobs.md`](./events-and-jobs.md) for full walkthroughs.

```bash
pnpm turbo gen event publish     # publisher contract
pnpm turbo gen event consume     # consumer handler + Payload event-task
pnpm turbo gen job               # background job + TaskConfig
pnpm turbo gen realtime channel  # realtime channel descriptor (ADR-016)
pnpm turbo gen realtime handler  # inbound realtime handler (ADR-016)
```

The event/job generators insert at six fixed `// <gen:*>` anchor comments. Generated features include four of them automatically (the `// <gen:job-tasks>` location is in `integrations/cms/index.ts`, which is manually authored as part of Phase-2 wiring); pre-existing features were retrofitted in ADR-015.

The realtime generators insert at three additional fixed `// <gen:realtime-*>` anchor comments (`// <gen:realtime-channels>` in `src/index.ts`, `// <gen:realtime-handler-symbols>` in `src/di/symbols.ts`, `// <gen:realtime-handlers>` in both `bind-*.ts` files). Generated features include all three automatically; pre-existing features were retrofitted in ADR-016.

## Cross-links

- `CLAUDE.md` — Key Conventions (factory-style use cases, `.toDynamicValue()`,
  schemas-in-use-case, three binding modes per feature, span + capture sandwich)
- `packages/navigation/AGENTS.md` — canonical reference shape the templates mirror
- `docs/architecture/vertical-feature-spec.md` — design rationale for the layout
- `docs/decisions/adr-012-lazar-conformance.md` — file naming + factory pattern
- `docs/decisions/adr-013-input-output-unification.md` — schemas-in-use-case + presenter
- `docs/decisions/adr-014-instrumentation-sentry.md` — span + capture wiring (R41–R44)
- `docs/decisions/adr-015-events-and-jobs.md` — cross-feature events + background jobs
- `docs/decisions/adr-016-realtime-layer.md` — Socket.IO realtime channels + handlers
