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TypeScript Best Practices

Write better TypeScript code with these essential best practices

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TypeScript前端最佳实践

TypeScript has become essential for building robust JavaScript applications. Here are some best practices to follow.

Use Strict Mode

Always enable strict mode in your tsconfig.json:

JSON
{
  "compilerOptions": {
    "strict": true
  }
}

Avoid any

The any type defeats TypeScript's purpose. Use unknown instead:

TypeScript
// Bad
function processData(data: any) {
  return data.value
}

// Good
function processData(data: unknown) {
  if (typeof data === 'object' && data !== null && 'value' in data) {
    return (data as { value: string }).value
  }
}

Type Inference

Let TypeScript infer types when possible:

TypeScript
// Bad
const count: number = 0

// Good
const count = 0

Use Utility Types

TypeScript provides useful utility types:

TypeScript
interface User {
  id: number
  name: string
  email: string
  password: string
}

// Pick specific properties
type PublicUser = Pick<User, 'id' | 'name' | 'email'>

// Omit specific properties
type CreateUser = Omit<User, 'id'>

Type Guards

Write type guards to narrow types:

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

Conclusion

Following these best practices will help you write more maintainable and type-safe TypeScript code!