// Less optimal
const data = fetchUserData();

// More optimal
const data: UserData = fetchUserData();

![Abstract flowing light rays in neon green and off-white colors forming a dynamic spiral pattern captured from a diagonal perspective with energy waves rippling through space high-quality ultra-realistic cinematic 8K UHD high resolution sharp and detail](/image_generation/tillitsdone_Typescript_Tips-and-tricks_topics_find_Optimizing-TypeScript-Code-for-Better-Performancecontent_1732730000360_1.jpeg "Abstract flowing light rays in neon green and off-white colors forming a dynamic spiral pattern captured from a diagonal perspective with energy waves rippling through space high-quality ultra-realistic cinematic 8K UHD high resolution sharp and detail")

Smart Interfaces Over Large Types

Break down large interfaces into smaller, reusable pieces. This improves compilation time and makes your code more maintainable.

typescript
Copy
// Better approach
interface Name {
  first: string;
  last: string;
}

interface UserCore {
  id: number;
  name: Name;
}

interface UserDetails extends UserCore {
  email: string;
  preferences: UserPreferences;
}
Leverage Const Assertions

Using const assertions can help TypeScript optimize your code by creating more specific types:

typescript
Copy
const config = {
  apiUrl: 'https://api.example.com',
  timeout: 5000,
} as const;

![Futuristic crystalline structure with sharp angles and smooth surfaces in canary yellow and off-black gradient photographed from a low angle perspective with light refractions high-quality ultra-realistic cinematic 8K UHD high resolution sharp and detail](/image_generation/tillitsdone_Typescript_Tips-and-tricks_topics_find_Optimizing-TypeScript-Code-for-Better-Performancecontent_1732730000360_2.jpeg "Futuristic crystalline structure with sharp angles and smooth surfaces in canary yellow and off-black gradient photographed from a low angle perspective with light refractions high-quality ultra-realistic cinematic 8K UHD high resolution sharp and detail")

Performance-Critical Code

For performance-critical sections, consider using type assertions and specialized types:

typescript
Copy
type Vector = [number, number];

function optimizedCalculation(v: Vector) {
  // Performance-critical code
  return (v[0] * v[0] + v[1] * v[1]) ** 0.5;
}

Remember to always measure performance impacts before and after optimization. Not all optimizations are worth the added complexity.

![A minimalist stone texture pattern with geometric shapes in gold and amethyst colors shot from a straight-on perspective featuring clean lines and sharp contrasts high-quality ultra-realistic cinematic 8K UHD high resolution sharp and detail](/image_generation/tillitsdone_Typescript_Tips-and-tricks_topics_find_Optimizing-TypeScript-Code-for-Better-Performancecontent_1732730000360_3.jpeg "A minimalist stone texture pattern with geometric shapes in gold and amethyst colors shot from a straight-on perspective featuring clean lines and sharp contrasts high-quality ultra-realistic cinematic 8K UHD high resolution sharp and detail")

Copy