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Partial & Required

Intermediate~18 min

Partial and Required utility types transform object types by making properties optional or required.

Partial & Required Types

Output 
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Utility Types:
  • Partial<T> - Makes all properties optional
  • Required<T> - Makes all properties required

When to Use

Utility Use Case Example
Partial Updates, patches updateUser(partial)
Required Ensure all fields validateConfig(required)

Common Mistakes

1. Using Partial for New Objects

// ✗ Wrong - new users should have all fields
function createUser(user: Partial) { }

// ✓ Correct - use full type for creation
function createUser(user: User) { }
function updateUser(updates: Partial) { }
Best Practice: Use Partial for updates/patches, Required to enforce completeness.

Summary

  • Partial<T> makes all properties optional
  • Required<T> makes all properties required
  • Perfect for update operations and validation
  • Built-in TypeScript utility types
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