invoice-craft/dist/core/calculations.js

Customizable, browser-first invoice PDF generator library with modern TypeScript API

export function calculateTotals(invoice) {
    let subtotal = 0, totalTax = 0;
    invoice.items.forEach(item => {
        subtotal += item.quantity * item.unitPrice;
        if (item.taxRate) {
            totalTax += (item.quantity * item.unitPrice * item.taxRate) / 100;
        }
    });
    const discount = invoice.discount || 0;
    const total = subtotal + totalTax - discount;
    return { subtotal, totalTax, discount, total };
}