Only a small supplement: If we generalize such an ordinary constraint, i.e. make the value constructor (the NonEmpty portion of NonEmpty<A>) itself polymorphic, we obtain a type class constraint. Since TS doesn't support type constructors like T<A> we can use dictionary passing style (pass the type class constraint as a normal argument to the polymorphic function) or resort to HKT hacks as pursued by FP-TS.
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Only a small supplement: If we generalize such an ordinary constraint, i.e. make the value constructor (the
NonEmptyportion ofNonEmpty<A>) itself polymorphic, we obtain a type class constraint. Since TS doesn't support type constructors likeT<A>we can use dictionary passing style (pass the type class constraint as a normal argument to the polymorphic function) or resort to HKT hacks as pursued by FP-TS.