javascript - NodeJs csv module - pause & resume -

i using nodejs csv module parse 10000 record big csv , @ each record i.e., .on('record', func), have implement time consuming logic. node doesnt wait till done. how handle this? docu talks http://www.adaltas.com/projects/node-csv/ pause() , resume(). use it?

    var csv = require('csv');     var fs = require('fs');     csv()     .from.stream(fs.createreadstream(__dirname+'/sample.in'))     .to.path(__dirname+'/sample.out')     .transform( function(row){       row.unshift(row.pop());       return row;     })     .on('record', function(row,index){               //time consuming logic goes here     })     .on('end', function(count){       console.log('number of lines: '+count);     })     .on('error', function(error){       console.log(error.message);     }); 

i got working. node-csv developer

//read through csv file 1 row @ time csv()     .from(__dirname+'data.csv', { columns: true })     .transform(function(row, index, next){          settimeout(function(){          console.log(row);          next()          }, 3000); //replace settimeout fn , call next() in callback      }, {parallel: 1})     .on("end", function (count) {       var finalcount = count;       var logtext = 'summary: total count: ' + finalcount + '\n'                      + 'error count:' + errorcount  + "("+errorarray+")"                     + '\n' + 'success count:' + successcount;       fs.appendfile(config.logfilename, '\n'+ logtext, function (err) {         console.log(logtext);       });           console.log("done", count);     });