salix/print/templates/reports/letter-debtor/letter-debtor.js

const Component = require(`${appPath}/core/component`);
const reportHeader = new Component('report-header');
const reportFooter = new Component('report-footer');

module.exports = {
    name: 'letter-debtor',
    async serverPrefetch() {
        this.client = await this.fetchClient(this.recipientId);
        this.sales = await this.fetchSales(this.recipientId, this.companyId);

        if (!this.client)
            throw new Error('Something went wrong');
    },
    computed: {
        dated: function() {
            const filters = this.$options.filters;

            return filters.date(new Date(), '%d-%m-%Y');
        }
    },
    data() {
        return {totalBalance: 0.00};
    },
    methods: {
        fetchClient(clientId) {
            return this.findOneFromDef('client', [clientId]);
        },
        fetchSales(clientId, companyId) {
            return this.findOneFromDef('sales', [
                clientId,
                companyId
            ]);
        },
        getBalance(sale) {
            if (sale.debtOut)
                this.totalBalance += parseFloat(sale.debtOut);

            if (sale.debtIn)
                this.totalBalance -= parseFloat(sale.debtIn);

            return parseFloat(this.totalBalance.toFixed(2));
        },
        getTotalDebtOut() {
            let debtOut = 0.00;
            this.sales.forEach(sale => {
                debtOut += sale.debtOut ? parseFloat(sale.debtOut) : 0;
            });

            return debtOut.toFixed(2);
        },
        getTotalDebtIn() {
            let debtIn = 0.00;
            this.sales.forEach(sale => {
                debtIn += sale.debtIn ? parseFloat(sale.debtIn) : 0;
            });

            return debtIn.toFixed(2);
        },
    },
    components: {
        'report-header': reportHeader.build(),
        'report-footer': reportFooter.build()
    },
    props: {
        recipientId: {
            required: true
        },
        companyId: {
            required: true
        }
    }
};