TypeScript Best Practices for 2024

TypeScript has become essential for modern JavaScript development. Let's explore best practices for writing excellent TypeScript code.

1. Use Strict Mode

Always enable strict mode in your tsconfig.json:

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

2. Prefer Type Inference

Let TypeScript infer types when possible:

// Good
const count = 0; // TypeScript infers number

// Unnecessary
const count: number = 0;

3. Use Union Types

Instead of using any, use union types:

type Status = 'pending' | 'success' | 'error';

4. Avoid Type Assertions

Use type guards instead of assertions:

function isString(value: unknown): value is string {
  return typeof value === 'string';
}

5. Leverage Utility Types

Use built-in utility types:

type Partial<T>
type Required<T>
type Readonly<T>
type Pick<T, K>
type Omit<T, K>

Conclusion

These practices will help you write more robust and maintainable TypeScript code.