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PR #482 — fix(checkout): apply discount before tax
1 issue found
41function calculateTotal(cart) {
42 let subtotal = sumItems(cart);
43 let total = subtotal * TAX_RATE;
43 let discounted = applyDiscount(subtotal, cart.promo);
44 let total = discounted * TAX_RATE;
45 return round(total, 2);
46}
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discountedgo negative when the cart subtotal is smaller than the discount. Line 44 will then compute tax on a negative total. Clamp at zero before multiplying.