ESCPOS-Printing-in-Node.js

This is my implementation of ESCPOS Printing from within node nw.js applications
This is a fully working demo project, the mere module is available at:
https://www.npmjs.com/package/pure-escpos

ADVANTAGE: nothing else needed i.e. no dependencies except built in modules:
'fs' , 'os' ( in fact only needed when using on multiple platforms), and 'child process'

CEAVEAT: as its based on copying files to the printer-queue biderectional commands are not supported
Tried to implement all basically necessary (and common betweeen printer models ) commands in an easy usable fashion

TODO: improve error tracking, implement more of the full command list, implement OSX

Prerequisites:
On Windows as of Version 1.1.1 Powershell is now used instead ofcmd(netview) to detect Printers
Hope this will help as no locale specific Keyword for printer is used(hardcoded).
At least one RAW-printer needs to be installed on the system :
Under WINDOWS : just use the printer driver to install, most modern printers support both modes (driver and RAW) automatically and !!! share the printer using a NAME which will be listed when network shares are ealuated
On LINUX (and OSX): just install a (driverless) RAW Printer it will be listed by lp

Usage:

 // if installed via npm
 //Printer = require('escpos_printing.js');
 // or if simply in working directory
 Printer = require('./escpos_printing.js');
 Printer.ESCPOS_INIT();
 Printer.append(put commands and functions here);
 var sucess = Printer.ESCPOS_PRINT(currentPrinter);
    if(!sucess){
       alert(Printer.ESCPOS_LASTERROR);
    }           

Functions summary:
ESCPOS_INIT : Initialize globals and lists printers to array
append : adds commands and Text to the "Print Buffer"
ESCPOS_CMD : submit a command (as defined in the set)
ESCPOS_PRINT : collect "Printer Buffer" write it to a prt file and send the file to the printer-queue
ESCPOS_IMAGEFILE : print image from a file
ESCPOS_BARCODE : Print Barcodes
ESCPOS_QRCODE : Print QR-Codes
ESCPOS_CPBYNUMBER : Select a codepage ( Named Versions available as extra command sets)
ESCPOS_CP_EPSON : Select codepage as defined by epson
ESCPOS_CP_STAR : Select Codepage as defined by STAR using standard ESCPOS Command
STAR_CP : Select codepage using a special command used by star printers
ESCPOS_CHARSET : select international characterset

for more examples of usage look at main.js