// TODO: fix this later
function processData(data) {
  // hardcoded for now
  var result = [];
  for (var i = 0; i < data.length; i++) {
    if (data[i] != null) {
      console.log('processing');
      result.push(data[i].value);
    }
  }
  return result; // FIXME
}

function getUser(id) {
  // no error handling
  return db.query('SELECT * ' + id);
}

Project Architecture

src/
  modules/
    user.service.ts
    data.processor.ts
    auth.guard.ts
  infrastructure/
    database.ts
    cache.ts
  tests/
    *.spec.ts

→ Request → Auth → Service → DB
→ Cache: Redis for hot paths
→ Events: async message queue

interface DataService<T> {
  process(items: T[]): ProcessedResult<T>;
}

class DataProcessor<T> implements DataService<T> {
  @LogExecution
  process(items: T[]): ProcessedResult<T> {
    const valid = items.filter(this.isValid);
    return { data: valid, count: valid.length };
  }

  private isValid(item: T): item is NonNullable<T> {
    return item != null;
  }
}

✓ Strict mode enabled
✓ Full type coverage

Test Suite: DataProcessor

✓ should filter null values       12ms
✓ should return correct count     8ms
✓ should handle empty array       3ms
✓ should log execution time      15ms
✓ should retry on transient fail  22ms

Coverage Report
███████████████████████████ 98.7%

Tests: 47 passed, 0 failed · 1.8s

$ deploy production

✓ Building application...
✓ Running tests...
✓ Optimizing bundle...
✓ Deploying to AWS...

☆ Deployed successfully

  URL:      https://api.smartatlas.io/v2
  Status:   Healthy
  Uptime:   99.97%
  Response: 14ms avg

$