Function suppliersExcludedBySearchFilters

suppliersExcludedBySearchFilters(
meta: SupplierMetaMap,
filters: { shippingType: readonly string[]; country: readonly string[] },
): Set<string>

The supplier class names ruled out by the active shipping-type and/or country filters. A supplier is excluded when a non-empty shipping filter names no scope its own scope can fulfill (per the shippingCovers hierarchy), or a non-empty country filter doesn't list its country. An empty filter constrains nothing.

Parameters

meta: SupplierMetaMap
Supplier shipping/country metadata (from SupplierFactory.supplierShippingMeta).
filters: { shippingType: readonly string[]; country: readonly string[] }
The active shippingType and country selections.

Returns Set<string>

The set of supplier class names no result could satisfy under the filters.

Example

suppliersExcludedBySearchFilters(
  { A: { country: 'US', shipping: 'worldwide' }, B: { country: 'US', shipping: 'domestic' } },
  { shippingType: ['worldwide'], country: [] },
); // => Set { 'B' }  (domestic can't fulfill a worldwide request)

Source

export function suppliersExcludedBySearchFilters(
  meta: SupplierMetaMap,
  filters: { shippingType: readonly string[]; country: readonly string[] },
): Set<string> {
  const excluded = new Set<string>();
  const requestedScopes = filters.shippingType.filter(isShippingRange);
  const byShipping = requestedScopes.length > 0;
  const byCountry = filters.country.length > 0;
  if (!byShipping && !byCountry) return excluded;

  for (const [key, { country, shipping }] of Object.entries(meta)) {
    if (byShipping && !requestedScopes.some((requested) => shippingCovers(shipping, requested))) {
      excluded.add(key);
    } else if (byCountry && !filters.country.includes(country)) {
      excluded.add(key);
    }
  }
  return excluded;
}