Inheritance — ASL

Inheritance

A type can extend one or more other types. All properties, links, indexes, and computed fields are inherited.

type User extends Timestamped {
  required email: str;
}

type Admin extends User, Audited {
  required level: int32;
}

Deprecation Notice: The extending keyword is deprecated in favor of extends. Running axel fmt will automatically migrate extending to extends.

Inheriting from an abstract type is the common way to share a common id / created_at / updated_at base across many concrete types.