Node Escpos print image on second try - express

Question

Hello i am creating an express service that prints to a pos printer at http request. The problem is that my solution does not print images on the first print but it does at the second and so on.
I am using https://github.com/song940/node-escpos
Here is my server.js
var print = require('./print')
var express = require('express')
var cors = require('cors')
var bodyParser = require('body-parser');
var app = express();
var corsOptions = {
origin: '*',
optionsSuccessStatus: 200 // some legacy browsers (IE11, various SmartTVs) choke on 204
}
app.get('/print', cors(corsOptions), (req, res) => {
print.demoPrint();
return res.send(req.body);
});
app.listen(3000, () => {
console.log('Express server is started')
});
Here is my print.js
const escpos = require('escpos');
const device = new escpos.USB(0x1504,0x003d);
const options = { encoding: "GB18030"};
const printer = new escpos.Printer(device);
const fs = require('fs')
const printSettings = JSON.parse(fs.readFileSync('printConfig.json', 'utf8'));
exports.demoPrint = () => {
device.open(function() {
printSettings.forEach((currentLine) => {
if(currentLine.printType === "text") {
console.log("PRINTING TEXT");
printer
.font(currentLine.font)
.align(currentLine.align)
.style('bu')
.size(currentLine.size, currentLine.size)
.text(currentLine.text)
}
else if(currentLine.printType === "image") {
escpos.Image.load(currentLine.path, (image) => {
console.log("PRINTING IMAGE");
printer
.align(currentLine.align)
.size(currentLine.size, currentLine.size)
.image(image)
});
}
else if(currentLine.printType === "barcode") {
console.log("PRINTING BARCODE");
printer
.align(currentLine.align)
.barcode(currentLine.text, 'CODE39', {
height: 64,
font: 'B'
});
}
});
printer
.text('\n')
.text('\n')
.cut()
.close();
});
};

Answer 1

Since this hasn't been answered yet I will provide the solution that worked for me. The problem was that the images were starting to load on the first time I submitted a request. By the second time I submitted a request the images were already loaded and were successfully printed.
I solved the problem by a adding a check that would not allow to print until the images were loaded.