Class Form<T, U>

Converts a structurally typed item into a nominally typed JavaScript object, optionally based on the provided prototype object.

Converts a nominally typed JavaScript object into its structurally typed equivalent, optionally based on the provided prototype item.

Returns the key of the tag attribute that distinguishes structures of this Form; returns undefined if this Form has no distinguishing tag attribute. Used to accelerate distrcrimination of polymorphic structural types with nominal type hints.

Returns a version of this Form that requires a head [Attr] with the given tag name.

Returns a default–possibly undefined–value of type T. Used as the fallback return value when [Item.coerce coercing] an invalid structural value.

Returns a version of this Form with the given unit value.