Optional & Enum

Optional

Fields that can be missing:

Optional(String())      // string or undefined
Optional(Number(), 0)    // with default value

Enum

Pick from a list:

Enum(['active', 'inactive', 'pending'])

Literal

Exact value:

Literal('admin')     // only 'admin'
Literal(1)          // only 1
Literal(true)       // only true

Union

Combine multiple types into one. See the Unions guide for detailed usage.

Next: Unions