How to use the ow.null function in ow

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github CrystallizeAPI / crystallize-frontend-boilerplate / server / lib / crystallize.js View on Github external
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

  let discount = null;

  if (items.length === 0) {
    return {
      success: false,
      validatedBasket: {


Function argument validation for humans

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