# TypeScript Audit Report

**Branch**: fix/issue-28-graph-corruption-shallow-copy
**Base**: main
**Date**: 2025-11-28 11:04

---

## Summary of TypeScript Changes in This Branch

This branch introduces the following TypeScript-related changes:

1. **Type Safety Improvement** (`src/services/handlers/worker-handler.ts`):
   - Replaced `any` type with proper `Worker` type in `getWorkerStats()` return signature
   - Line 395-398: `workers: readonly any[]` changed to `workers: readonly Worker[]`

2. **Interface Extension** (`src/core/interfaces.ts`):
   - Added optional `recordSpawn?(): void` method to `ResourceMonitor` interface
   - Lines 50-55: Proper JSDoc documentation included

3. **Implementation** (`src/implementations/resource-monitor.ts`):
   - `SystemResourceMonitor.recordSpawn()`: Lines 175-181
   - `TestResourceMonitor.recordSpawn()`: Lines 413-415

---

## Issues in Your Changes (BLOCKING)

**No blocking issues found.**

The TypeScript changes in this branch are improvements:

1. **Worker Type Fix** - The change from `any[]` to `Worker[]` is a correct type narrowing that improves type safety. The `Worker` type is properly imported from `../../core/domain.js` on line 19.

2. **Optional Method Pattern** - The `recordSpawn?(): void` optional method in the interface is correctly typed and follows TypeScript best practices for optional interface methods.

3. **Implementation Consistency** - Both `SystemResourceMonitor` and `TestResourceMonitor` correctly implement the `recordSpawn()` method with the proper `void` return type.

---

## Issues in Code You Touched (Should Fix)

**No should-fix issues found.**

The files modified in this branch have clean TypeScript implementations:

### `src/services/handlers/worker-handler.ts`
- Strict mode compliant
- Proper use of branded types (`TaskId`, `WorkerId`)
- Result pattern used throughout
- Line 296: `this.resourceMonitor.recordSpawn?.()` - proper optional chaining for the new method

### `src/core/interfaces.ts`
- Interface properly extends with optional method
- JSDoc documentation present
- No loose types

### `src/implementations/resource-monitor.ts`
- Private fields properly typed
- `recentSpawnTimestamps: number[]` - correctly typed array
- All logging context objects are properly typed

### `src/core/dependency-graph.ts`
- The deep copy fix is pure TypeScript with proper generics
- Line 253-255: `new Map(Array.from(this.graph.entries()).map(([k, v]) => [k, new Set(v)]))`
- Type inference works correctly for Map and Set operations

---

## Pre-existing Issues (Not Blocking)

The following `any` types exist in the codebase but were NOT introduced by this branch:

### HIGH Priority (In Core Interfaces)

| File | Line | Issue | Impact |
|------|------|-------|--------|
| `src/core/interfaces.ts` | 205-206 | `emit(event: string, ...args: any[]): void` and `off(event: string, listener: (...args: any[]) => void): void` in `TaskEventEmitter` | Type-unsafe event system |

### MEDIUM Priority (In Event Bus)

| File | Line | Issue | Impact |
|------|------|-------|--------|
| `src/core/events/event-bus.ts` | 28 | `on?(event: string, handler: (data: any) => void): string` | Loose event handler typing |
| `src/core/events/event-bus.ts` | 30-31 | `once?(event: string, handler: (data: any) => void): void` and `onRequest?` with `any` | Loose typing |
| `src/core/events/event-bus.ts` | 240 | `async request<T extends DelegateEvent, R = any>` | Default any for response |
| `src/core/events/event-bus.ts` | 297, 505, 529-530, 545 | Multiple `as any` casts | Type assertions without validation |

### LOW Priority (In Container/CLI)

| File | Line | Issue | Impact |
|------|------|-------|--------|
| `src/core/container.ts` | 10 | `type Service = { factory: Factory<any>; singleton: boolean; instance?: any }` | DI container type erasure |
| `src/core/container.ts` | 177, 186, 189, 199, 202, 211 | Multiple `as any` casts | Type assertions |
| `src/cli.ts` | 165, 221 | `taskManager = taskManagerResult.value as any` | Type assertion |
| `src/types.ts` | 20 | `data?: any` in `ToolResponse` | Loose response typing |

### LOW Priority (Exception Handling)

| File | Line | Issue | Impact |
|------|------|-------|--------|
| `src/core/errors.ts` | 212 | `(error as any).message` | Missing unknown type guard |
| `src/services/worktree-manager.ts` | 488 | `(error as any).code === 'ENOENT'` | Missing unknown type guard |

---

## TypeScript Configuration Analysis

**tsconfig.json** is properly configured with strict mode:

```json
{
  "strict": true,
  "noImplicitReturns": true,
  "forceConsistentCasingInFileNames": true
}
```

**Observations**:
- `noUnusedLocals: false` and `noUnusedParameters: false` - Could be enabled for stricter checks
- Strict mode is enabled, which enforces `noImplicitAny`, `strictNullChecks`, `strictFunctionTypes`, etc.

---

## Summary

**Your Changes:**
- CRITICAL: 0
- HIGH: 0
- MEDIUM: 0
- LOW: 0

**Code You Touched:**
- HIGH: 0
- MEDIUM: 0
- LOW: 0

**Pre-existing:**
- HIGH: 2 occurrences (TaskEventEmitter interface)
- MEDIUM: 8 occurrences (EventBus)
- LOW: 10 occurrences (Container, CLI, Error handling)

**TypeScript Score**: 9/10

The branch demonstrates excellent TypeScript practices:
- Removed an `any` type (improved type safety)
- Added properly typed optional interface method
- Correct use of optional chaining (`?.()`)
- Deep copy fix uses proper Map/Set generics

Points deducted:
- -0.5: Pre-existing `any` types in related event bus code
- -0.5: Some `as any` casts in DI container (pre-existing)

**Merge Recommendation**: APPROVED

The TypeScript changes in this branch are improvements, not regressions. The `any` type was removed and replaced with the proper `Worker` type. The new `recordSpawn()` method is correctly typed as optional in the interface and properly implemented in both concrete classes.
