отсортировать используя var sort = require('sort-stream')
 

отсортировать используя var sort = require('sort-stream')
дает ошибку output is not defined

var fs = require('fs');
var request = require("request");
var parse = require('csv-parse');
var sort = require('sort-stream')


var lineReader = require('readline').createInterface({
    input: fs.createReadStream('./tickers.txt')
});
console.log('Ticker'+ '    '+'Price');
lineReader.on('line', function (line) {
    
    var baseURL = 'http://ichart.finance.yahoo.com/table.csv?s=';
    var requestURL = baseURL + line;



    request(requestURL, function(error, response, body) {


        var stockData = body;

        parse(stockData, {delimiter: ','}, function(err, output){
          
            var lastEntry = output[1].toString();
            var lastEntryArray= lastEntry.toString().split(",");
            var adjustedClose = lastEntryArray[lastEntryArray.length-1];

            var output = line + "      " + adjustedClose;
            console.log(output)
       });
   }).pipe(sort(function(a,b){
        if (a < b) return -1;
        if (a > b) return 1;
        return 0;
    })).pipe(output);



});