This is fork of (escpos-buffer)[https://github.com/grandchef/escpos-buffer]. Point of this for is to remove dependency on node-js's fs lib, so it can be used also in a browser.

ESC/POS Printer Library

Library to generate buffer for thermal printers.

Install

Run command bellow on your project folder

yarn add escpos-buffer-web

or

npm install escpos-buffer-web

Basic example

const { Printer, Style, Align, Drawer, Model, InMemory } = require('escpos-buffer')

const model = new Model('MP-4200 TH')
const connection = new InMemory()
const printer = new Printer(model, connection)
printer.columns = 56
printer.writeln('                    Some fancy title                    ', Style.DoubleHeight | Style.Inverted)
printer.write('Simple Text *** ')
printer.writeln('Bold Text -> complete line text.[]123456', Style.Bold)
printer.writeln('Double height', Style.DoubleHeight | Style.Bold, Align.Center)
printer.writeln('Áçênts R$ 5,00', Style.DoubleWidth | Style.DoubleWidth, Align.Center)
printer.writelnJustify('1x Pizza', '$ 20,00', Style.Bold);
printer.drawLine();
printer.withStyle({
  width: 4,
  height: 6,
  bold: true,
  italic: true,
  underline: true,
  align: Align.Center,
  }, () => {
    printer.writeln('You can apply multiple styles at once using withStyle()')
    printer.writeln('Font sizes 1-8 are available')
})
printer.writeln('Default style is restored afterwards')
printer.feed(6)
printer.buzzer()
printer.cutter()
printer.drawer(Drawer.First)
process.stdout.write(connection.buffer())

// to print, run command bellow on terminal
//> node examples/basic.js | lp -d MyCupsPrinterName

Usage in the browser

You can also use the new WebUSB protocol in Chrome to connect directly to the printer.

import { Printer, Model, WebUSB } from 'escpos-buffer'

const device = await navigator.usb.requestDevice({
  filters: [{
    vendorId: VENDOR_ID
  }]
})
const model = new Model('TM-T20')
const connection = new WebUSB(device)
await connection.open()
const printer = new Printer(model, connection)
// ...

Available scripts

• clean - remove coverage data, Jest cache and transpiled files,
• build - transpile TypeScript to ES6,
• build:watch - interactive watch mode to automatically transpile source files,
• lint - lint source files and tests,
• style:fix - fix prettier style problems,
• style:check - check for prettier style,
• test - run tests,
• test:watch - interactive watch mode to automatically re-run tests
• test:debug - run tests debugging

License

Licensed under the MIT. See the LICENSE file for details.