# NEXT_STEPS_424.md

## Status

v1.1 released 2026-04-24. All planned features complete. 468 tests passing.

### Completed

| Feature | Tests | Files |
|---------|-------|-------|
| Core Extension Points | 14 | `src/extension/types.ts`, `src/extension/registry.ts`, `src/formula/parser.ts` |
| Multipart Uploads | 9 | `src/types.ts`, `src/domain/schema-to-arbitrary.ts`, `src/domain/request-builder.ts`, `src/infrastructure/http-executor.ts`, `src/formula/evaluator.ts` |
| Streaming / NDJSON | 7 | `src/types.ts`, `src/infrastructure/http-executor.ts`, `src/formula/evaluator.ts` |
| Extension System Polish | 5 | `src/plugin/index.ts`, `src/domain/contract-validation.ts` |
| SSE Extension | 7 | `src/extensions/sse/` |
| Serializers Extension | 4 | `src/extensions/serializers/` |
| WebSockets Extension | 5 | `src/extensions/websocket/` |
| Code Cleanup | 5 | `src/formula/evaluator.ts`, `src/domain/error-suggestions.ts`, `src/extension/registry.ts`, `src/test/helpers.ts`, `src/test/runner-utils.ts` |

---

## Architecture

### Core vs Extensions

Core features require changes to the schema-to-arbitrary pipeline or HTTP executor:
- Multipart uploads
- Streaming/NDJSON
- Timeouts, redirects

Extensions are opt-in modules:
- SSE: specialized parser
- Serializers: external dependencies (protobuf, msgpack)
- WebSockets: different protocol

### Extension Registration

```typescript
await fastify.register(apophis, {
  extensions: [
    sseExtension,
    createSerializerExtension(registry),
    websocketExtension,
  ]
})
```

Each extension provides:
- `headers`: APOSTL operations for parser validation
- `predicates`: custom formula evaluation
- `onBuildRequest` / `onBeforeRequest` / `onAfterRequest`: lifecycle hooks
- `onSuiteStart` / `onSuiteEnd`: suite-level hooks

---

## Test Strategy

### First-Class Features

Red-green-refactor cycle:
1. Add operation to parser
2. Add parser test
3. Add operation to evaluator
4. Add evaluator test
5. Add HTTP executor support
6. Add integration test with Fastify
7. Add schema-to-arbitrary support (for multipart)
8. Add generation test
9. Add request builder support
10. Add end-to-end test

### Extensions

Self-contained modules with own test suites:

```typescript
// src/extensions/NAME/test.ts
import { test } from 'node:test'
import assert from 'node:assert'
import { extension } from './extension.js'

test('predicate returns correct value', () => {
  const resolver = extension.predicates!.predicate_name
  const result = resolver(mockContext)
  assert.strictEqual(result.value, expected)
})
```

---

## Migration

### v1.0 → v1.1

No breaking changes.

To use new features:
1. **Multipart**: add `x-content-type: multipart/form-data` to schema
2. **Streaming**: add `x-streaming: true` to response schema
3. **Extensions**: import and register via `extensions: [...]` option

---

## Reference

- **Architecture**: `docs/extensions/EXTENSION-ARCHITECTURE.md`
- **Quick Reference**: `docs/extensions/QUICK-REFERENCE.md`
- **Extension Specs**: `docs/extensions/WEBSOCKETS.md`, `HTTP-EXTENSIONS.md`
- **API Design**: `docs/API_REDESIGN_V1.md`