typescript

name: typescript description: TypeScript best practices and patterns for writing type-safe code path: typescript

Write TypeScript code following these principles:

Type Safety

• Prefer discriminated unions for state representation
• Use as const satisfies for configuration objects
• Avoid any - use unknown with proper type narrowing
• Use Zod or similar for runtime validation of external data

Code Style

• Use arrow functions over function declarations
• Prefer immutable data structures
• Use strict TypeScript compiler options

Patterns

// Discriminated union for state
type Result<T, E> = { success: true; data: T } | { success: false; error: E };

// Configuration with literal types preserved
const config = {
  mode: 'production',
  port: 3000,
} as const satisfies Config;