Optional & Enum

Optional

Fields that can be missing:

typescript

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

With shorthand:

typescript

{ name: 'string' }      // required
{ name: 'string?' }      // optional

Pick from a list:

typescript

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

Exact value:

typescript

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

Multiple options:

typescript

Union([Literal('a'), Literal('b')])