Computes a product's price per base unit as a currency-stable number for
sorting and filtering — the USD price (or raw price when there's no USD anchor)
divided by the quantity normalized to its cost base unit (grams for mass,
millilitres for volume, pieces for countable units; see
toCostBaseQuantity). Returns undefined when there's no price, no
quantity, or the unit can't be converted, so the value never becomes NaN.
Formats a product's price per base unit for display, e.g. "$0.08/g" or
"$19.99/pcs". Resolves the per-unit amount via resolveUnitPrice, then
renders it at two decimal places, collapsing any positive unit price below one
cent to "<$0.01/{unit}" (see formatPerUnitPrice) to keep the column
narrow. The unrounded value is available via formatUnitPriceExact for a
hover tooltip. Returns "" when there's no price or the quantity/unit can't be
converted.
Formats a product's price per base unit at full precision — up to four decimal
places, with no sub-cent collapse — for use as the hover tooltip behind the
rounded formatUnitPrice display, so a value shown as "<$0.01/g" or
"$0.07/g" reveals its actual "$0.0035/g" / "$0.072/g" on hover. Uses the
same resolved amount as the display formatter (see resolveUnitPrice).
Returns "" when there's no price or the quantity/unit can't be converted.
Formats a product or variant price for display, converting into the user's selected currency when a USD anchor is available.