Function nonNullTypeCases

src/Type.ts:412–421

(t: Type)

}

export function nonNullTypeCases(t: Type): OrderedSet<Type> {
    if (t.kind === "null") {
        return OrderedSet();
    }
    if (!(t instanceof UnionType)) {
        return OrderedSet([t]);
    }
    const nonNulls = removeNullFromUnion(t)[1];
    return OrderedSet(nonNulls);
}

// FIXME: The outer OrderedSet should be some Collection, but I can't figure out
// which one.  Collection.Indexed doesn't work with OrderedSet, which is unfortunate.