如何从nodejs中的csv文件中提取数据

var fs = require('fs');
var csv = require('csv');

csv()
 .from.stream(fs.createReadStream('nodetest.csv'))
 .to.array(function(data, count) {
    var lastLine = data.slice(-1)[0];
    var needed = lastLine.slice(-1)[0];
    console.log(needed);
  });
var fs = require('fs');
var csv = require('csv'