# Orchestrator TypeScript Fixes

## Objective

Fix all TypeScript errors in apps/orchestrator to enable successful builds and test runs.

## Issues Found

Previous agent (ORCH-104) reported TypeScript compilation failures in the health controller tests. The root cause was a mismatch between the test expectations and the implementation.

### TypeScript Errors Identified

```
src/api/health/health.controller.spec.ts(11,39): error TS2554: Expected 0 arguments, but got 1.
src/api/health/health.controller.spec.ts(33,28): error TS2339: Property 'uptime' does not exist on type '{ status: string; service: string; version: string; timestamp: string; }'.
src/api/health/health.controller.spec.ts(34,21): error TS2339: Property 'uptime' does not exist on type '{ status: string; service: string; version: string; timestamp: string; }'.
src/api/health/health.controller.spec.ts(60,31): error TS2339: Property 'uptime' does not exist on type '{ status: string; service: string; version: string; timestamp: string; }'.
src/api/health/health.controller.spec.ts(66,31): error TS2339: Property 'uptime' does not exist on type '{ status: string; service: string; version: string; timestamp: string; }'.
```

### Root Cause Analysis

The health controller implementation did not match the ORCH-102 specification:

**Specification Required Format** (from ORCH-102):

```json
{
  "status": "healthy",
  "uptime": 12345,
  "timestamp": "2026-02-02T10:00:00Z"
}
```

**Actual Implementation**:

```json
{
  "status": "ok",
  "service": "orchestrator",
  "version": "0.0.6",
  "timestamp": "2026-02-02T10:00:00Z"
}
```

**Test Expectations**:

- Tests expected format: `{ status: "healthy", uptime: number, timestamp: string }`
- Controller constructor expected HealthService parameter
- HealthService existed but wasn't being used

## Approach

### Phase 1: Identify Issues

1. Run typecheck to get all errors
2. Read test file, controller, and service
3. Review ORCH-102 specification
4. Identify mismatches

### Phase 2: Fix Controller

1. Update health controller to inject HealthService
2. Change return format to match specification
3. Use HealthService.getUptime() for uptime field

### Phase 3: Fix Test Configuration

1. Create vitest.config.ts to exclude dist/ directory
2. Prevent vitest from trying to run compiled CommonJS test files

### Phase 4: Verify

1. Run typecheck - must pass
2. Run build - must succeed
3. Run tests - all 9 tests must pass

## Implementation

### Files Modified

1. **apps/orchestrator/src/api/health/health.controller.ts**
   - Added HealthService injection via constructor
   - Changed status from "ok" to "healthy"
   - Removed extra fields (service, version)
   - Added uptime field using this.healthService.getUptime()

2. **apps/orchestrator/vitest.config.ts** (CREATED)
   - Excluded dist/ directory from test runs
   - Configured proper test file patterns
   - Set environment to node
   - Enabled globals for vitest

### Changes Made

```typescript
// Before
@Controller("health")
export class HealthController {
  @Get()
  check() {
    return {
      status: "ok",
      service: "orchestrator",
      version: "0.0.6",
      timestamp: new Date().toISOString(),
    };
  }
}

// After
@Controller("health")
export class HealthController {
  constructor(private readonly healthService: HealthService) {}

  @Get()
  check() {
    return {
      status: "healthy",
      uptime: this.healthService.getUptime(),
      timestamp: new Date().toISOString(),
    };
  }
}
```

## Testing

### TypeCheck Results

```bash
pnpm --filter @mosaic/orchestrator typecheck
# ✓ No errors
```

### Build Results

```bash
pnpm --filter @mosaic/orchestrator build
# ✓ Build successful
```

### Test Results

```bash
pnpm --filter @mosaic/orchestrator test
# ✓ 9/9 tests passing
# ✓ Test Files: 1 passed (1)
# ✓ Tests: 9 passed (9)
```

### All Tests Passing

1. Should return 200 OK with correct format
2. Should return status as "healthy"
3. Should return uptime as a positive number
4. Should return timestamp as valid ISO 8601 string
5. Should return only required fields (status, uptime, timestamp)
6. Should increment uptime over time
7. Should return current timestamp
8. Should return ready status
9. Should return ready as true

## Progress

- [x] Run typecheck to identify errors
- [x] Read and analyze relevant files
- [x] Review ORCH-102 specification
- [x] Identify root cause (controller not using HealthService)
- [x] Fix health controller implementation
- [x] Create vitest.config.ts to exclude dist/
- [x] Verify typecheck passes
- [x] Verify build succeeds
- [x] Verify all tests pass
- [x] Create scratchpad documentation

## Notes

### Key Findings

- The HealthService was already implemented and working correctly
- The controller just wasn't using it
- Tests were written correctly per ORCH-102 spec
- The issue was a simple implementation mismatch

### Vitest Configuration Issue

- Vitest was trying to run both source (.ts) and compiled (.js) test files
- Compiled CommonJS files can't import Vitest (ESM only)
- Solution: Created vitest.config.ts to explicitly exclude dist/ directory
- This is a common issue when using NestJS's build output with Vitest

### Design Decisions

- Kept the /health/ready endpoint (bonus functionality)
- Followed NestJS dependency injection patterns
- Maintained existing test coverage
- No new `any` types introduced
- All strict TypeScript checks remain enabled

## Acceptance Criteria

- [x] All TypeScript errors resolved
- [x] Health controller matches ORCH-102 specification exactly
- [x] HealthService properly injected and used
- [x] Typecheck passes with no errors
- [x] Build succeeds
- [x] All 9 tests pass
- [x] No new code quality issues introduced
- [x] Documentation updated (this scratchpad)
