[![Latest Version][version-badge]][npm-link]
[![Build Status][github-badge]][github-ci]
[![TypeScript version][ts-badge]][typescript-37]
[![Node.js version][nodejs-badge]][nodejs]
[![MIT][license-badge]][LICENSE]

> 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

```sh
yarn add escpos-buffer-web
```
or
```sh
npm install escpos-buffer-web
```

## Basic example
```js
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](https://caniuse.com/webusb) to connect directly to the printer.
```js
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](https://github.com/grandchef/escpos-buffer/blob/master/LICENSE) file for details.

[ts-badge]: https://img.shields.io/badge/TypeScript-3.7-blue.svg
[typescript-37]: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html

[nodejs-badge]: https://img.shields.io/badge/Node.js->=%2010-blue.svg
[nodejs]: https://nodejs.org/dist/latest-v10.x/docs/api/

[github-badge]: https://github.com/grandchef/escpos-buffer/actions/workflows/main.yml/badge.svg
[github-ci]: https://github.com/grandchef/escpos-buffer/actions

[license-badge]: https://img.shields.io/badge/license-MIT-blue.svg
[license]: https://github.com/grandchef/escpos-buffer/blob/master/LICENSE

[version-badge]: https://img.shields.io/npm/v/escpos-buffer-web?label=escpos-buffer-web
[npm-link]: https://www.npmjs.com/package/escpos-buffer-web