TypeScript Best Practices for 2025

Development
1 minute read

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Enable Strict Mode

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{
  "compilerOptions": {
    "strict": true,
    "noImplicitAny": true
  }
}

Interfaces vs Type Aliases

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// Good: Using interface for public API
interface User {
  id: string;
  name: string;
  email: string;
}

// Type aliases for unions
type UserResponse = User | Error;

Utility Types

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// Create types from existing ones
type PublicUser = Omit<User, 'password'>;
type PartialUser = Partial<User>;
type RequiredUser = Required<User>;

Avoid any Type

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  • Use unknown for unknown types
  • Generic types for flexible functions
  • Type guards for validation

"Lorem ipsum dolor sit amet. TypeScript's power comes from its type system."
— TypeScript Guide

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