Echo from bat file

app.js

(function() {
    var childProcess = require("child_process");
    var oldSpawn = childProcess.spawn;
    function mySpawn() {
        console.log('spawn called');
        console.log(arguments);
        var result = oldSpawn.apply(this, arguments);
        return result;
    }
    childProcess.spawn = mySpawn;
})();

var spawn = require('child_process').spawn;
var ls    = spawn(__dirname + '\\teste.bat',[],{stdio:'inherit'});
/*
ls.stdout.on('data', function (data) {
	console.log('stdout: ' + data);
});

ls.stderr.on('data', function (data) {
	console.log('stderr: ' + data);
});
*/

ls.on('exit', function (code) {
	console.log('child process exited with code ' + code);
});

ls.on('uncaughtException', function(err) {
    console.log('Caught exception: ' + err);
});

teste.bat

@echo off
echo aparece alguma coisa!