TypeScript Tips for Clean Code

Writing Better TypeScript

TypeScript helps us write safer code, but there are patterns that make it even better.

1. Use Discriminated Unions

type Result<T> = 
  | { success: true; data: T }
  | { success: false; error: string };

2. Prefer unknown over any

// Bad
function parse(input: any) { ... }

// Good  
function parse(input: unknown) { ... }

3. Use Template Literal Types

type EventName = `on${Capitalize<string>}`;

4. Const Assertions

const colors = ['red', 'green', 'blue'] as const;
type Color = typeof colors[number]; // 'red' | 'green' | 'blue'

5. Utility Types Are Your Friends

Learn and use Pick, Omit, Partial, Required, and Record extensively.

Conclusion

These patterns will make your TypeScript code more type-safe and maintainable.