Type Alias FieldDef

A field definition within an ObjectSchema.

This is the union of all supported field types:

• PrimitiveFieldDef — "string", "number", "boolean"
• DateFieldDef — dates stored as ISO strings, exposed as Date objects
• ObjectFieldDef — nested objects via fields
• ArrayFieldDef — arrays/lists via items
• EnumFieldDef — string literal enums via values

Each variant is discriminated by the type property.