anahita-front/initialize/cart-total-invoice.js

export default (data) => {
    const items = {
        productsCount: 0,
        productsPrice: 0,
        discount: 0,
        totalFactor: 0
    }

    items.productsCount = data.length
    items.productsPrice =
        data.reduce((sum, item) => sum + item.product.price * item.quantity, 0)

    items.totalFactor =
        data.reduce(
            (sum, item) => sum + (item.product.specialPrice || item.product.price) * item.quantity,
            0
        )

    items.discount = items.productsPrice - items.totalFactor

    return items;
}