BaseTypeImpl.withConstraint() method

Create a new type based on the current type and use the given constraint function as validation.

Signature:

withConstraint<const BrandName extends string>(name: BrandName, constraint: Validator<ResultType>): Type<Branded<ResultType, BrandName>, TypeConfig>;

Parameters

Parameter	Type	Description
name	BrandName	the new name to use in error messages
constraint	Validator<ResultType>	the additional validation to restrict the current type

Returns:

Type<Branded<ResultType, BrandName>, TypeConfig>

Creates a brand. By creating a branded type, we ensure that TypeScript will consider this a separate type, see Branded for more information.