order getItemsCount.ts

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  import { LineItemMap } from '@bigcommerce/checkout-sdk';
 
export default function getItemsCount({
    physicalItems,
    digitalItems,
    giftCertificates,
    customItems,
}: LineItemMap): number {
    const totalItemsCount = [
        ...physicalItems,
        ...digitalItems,
        ...(customItems || []),
    ].reduce((total, item) => total += item.quantity, 0);
 
    return totalItemsCount + giftCertificates.length;
}