How to use the ow.null function in ow
To help you get started, we’ve selected a few ow examples, based on popular ways it is used in public projects.
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CrystallizeAPI / crystallize-frontend-boilerplate / server / lib / crystallize.js View on Github 
async function validateBasket(crystallizeBasket, _opt) {
ow(crystallizeBasket, ow.object);
const { items, coupon } = crystallizeBasket;
ow(items, ow.array);
ow(coupon, ow.any(ow.string, ow.null));
ow(_opt, ow.any(ow.object, ow.undefined));
const options = Object.assign(
{
excludeDiscount: true,
excludeShipping: true
},
_opt
);
let discount = null;
if (items.length === 0) {
return {
success: false,
validatedBasket: {
