castConstraint
castConstraint extends the typing of an already constrained value by adding one or more compatible constraints. It does not re-validate the value; it only adds constraint markers. TypeScript prevents invalid casts.
Interactive example
Syntax
Classic signature
typescript
function castConstraint(
constrainedType: ConstrainedType,
constraintHandler: ConstraintHandler | ConstraintHandler[]
): ConstrainedTypeParameters
constrainedType: A value already carrying one or more constraints.constraintHandler: A constraint handler (or an array of handlers) to add.
Return value
A new constrained value with the same wrapped value and the additional constraint markers.