Main Functions

Core application functions and entry points.

main()

The primary application function that demonstrates the template's capabilities.

Signature

export async function main(): Promise<void>

Description

Main application function that showcases:

• Async/await patterns
• Utility function usage
• Console output with timestamps
• Error handling via Promise rejection

Usage Example

import { main } from './index.js';

// Run the main application
await main();

// With error handling
try {
  await main();
  console.log('Application completed successfully');
} catch (error) {
  console.error('Application failed:', error);
}

Implementation Details

The function demonstrates:

1. Timestamp logging using formatTimestamp()
2. Async delays using delay()
3. Modern ES modules import/export
4. TSDoc documentation patterns

Error Handling

The function uses Promise-based error handling:

• Returns Promise<void> on success
• Rejects with error on failure
• Errors bubble up to caller

Performance

• Fast execution - typically completes in ~100ms
• Minimal memory usage - no persistent state
• Clean async patterns - proper Promise handling

Related Functions

Utility Integration

The main function integrates with utility functions:

• formatTimestamp() - For timestamp formatting
• delay() - For async delays

Testing

See the test suite in __tests__/index.test.ts for comprehensive examples:

• Normal execution testing
• Error condition testing
• Performance verification
• Output validation

Best Practices Demonstrated

Async/Await Usage

// ✅ Good - proper async/await
export async function main(): Promise<void> {
  await delay(100);
  console.log('Completed');
}

// ❌ Bad - missing await
export async function main(): Promise<void> {
  delay(100); // Promise not awaited
  console.log('Completed'); // Runs immediately
}

Error Propagation

// ✅ Good - let errors bubble up
export async function main(): Promise<void> {
  await riskyOperation(); // Errors propagate naturally
}

// ❌ Bad - swallowing errors
export async function main(): Promise<void> {
  try {
    await riskyOperation();
  } catch {
    // Error silently ignored
  }
}

Type Safety

// ✅ Good - explicit return type
export async function main(): Promise<void> {
  // Implementation
}

// ❌ Bad - implicit return type
export async function main() {
  // TypeScript infers return type
}