books/reports/SalesRegister/SalesRegister.js

const frappe = require('frappejs');

class SalesRegister {
    async run({ fromDate, toDate, customer }) {
        let filters = {};
        if(customer) {
          filters.customer = customer;
        }

        if (fromDate && toDate) {
          filters.date = ['>=', fromDate, '<=', toDate];
        }
        else if (fromDate) {
          filters.date = ['>=', fromDate];
        }
        else if (toDate) {
          filters.date = ['<=', toDate];
        }

        const invoices = await frappe.db.getAll({
            doctype: 'Invoice',
            fields: ['name', 'date', 'customer', 'account', 'netTotal', 'grandTotal'],
            filters: filters,
            orderBy: 'date',
            order: 'desc'
        });

        const invoiceNames = invoices.map(d => d.name);

        const taxes = await frappe.db.getAll({
            doctype: 'TaxSummary',
            fields: ['parent', 'amount'],
            filters: {
                parenttype: 'Invoice',
                parent: ['in', invoiceNames]
            },
            orderBy: 'name'
        });

        for (let invoice of invoices) {
            invoice.totalTax = taxes
                .filter(tax => tax.parent === invoice.name)
                .reduce((acc, tax) => {
                    if (tax.amount) {
                        acc = acc + tax.amount;
                    }
                    return acc;
                }, 0);
        }

        return { rows: invoices };
    }
}

module.exports = SalesRegister;