nodejs jsreport client stream

jsreportClient.js

// @ts-check
const fs = require('fs');
const client = require("jsreport-client")("http://localhost:5488");
const { finished } = require('stream');

(async () => {

    try {
        const data = {
            "customer": "Тратата через атом!!",
            "month": "May",
            "taxPercentage": 0.21,
            "detail": [
                { "date": "2019-04-03", "product": "Vitamin C", "category": "Health", "unitPrice": 25, "quantity": 1, "discountPercentage": 0  },
                { "date": "2019-04-03", "product": "Probiotics", "category": "Health", "unitPrice": 83, "quantity": 1, "discountPercentage": 0.25 }
            ]
        };

        await new Promise(async (resolve, reject) => {
            const report = await client.render({
                template: {
                    name: 'sales-main'
                },
                data
            });

            const w = fs.createWriteStream('report.xlsx');
            report.pipe(w);
    
            finished(report, (err) => {
                if (err) {
                    console.error('Report stream failed:', err);
                    reject(err);
                }
            });
            finished(w, (err) => {
                if (err) {
                    console.error('Writable stream failed:', err);
                    return reject(err);
                }
                resolve();
            });
        });
    } catch (err) {
        console.error(err);
    }

    process.exit(0);

})();