TypeError: object is not a function

console

.../OLAF-fully-automated-ingestion$ foreman run node test.js 

/Users/giacecco/Projects/OLAF-fully-automated-ingestion/test.js:4
csv()
^
TypeError: object is not a function
    at Object.<anonymous> (/Users/giacecco/Projects/OLAF-fully-automated-ingestion/test.js:4:1)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:906:3
.../OLAF-fully-automated-ingestion$ 

test.js

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

csv()
    .from.stream(fs.createReadStream(__dirname + '/pp-1995.csv'))
    .to.path(__dirname + '/sample.out')
    .on('record', function(row,index){
        console.log('#' + index + ' ' + JSON.stringify(row));
    })
    .on('end', function(count){
        console.log('Number of lines: ' + count);
        callback(null);
    })
    .on('error', function(error){
        console.log(error.message);
    });