remove duplicates vcf

contact-to-vcf

const csv = require('csv-parser')
const fs = require('fs')
var vCardJS = require('vcards-js');

let outputStream = fs.createWriteStream('new_contacts.vcf', 'utf8');
let inputStream = fs.createReadStream('new_contacts.csv', 'utf8');
let allContacts = []
inputStream
.pipe(csv())
	.on('data', function (row) {
	    
        allContacts.push(row)
	})
	.on('end', function () {
	    console.log('No more rows!');
        
        const contactWithNumbers = allContacts.filter(c => {
            return c['Home Phone'] || c['Business Phone'] || c['Mobile Phone']
        })
        contactWithNumbers.forEach(c => {
            var vCard = vCardJS();
            vCard.firstName = c['First Name']
            vCard.lastName = c['Last Name']
            vCard.homePhone = c['Home Phone']
            vCard.businessPhone = c['Business Phone']
            vCard.mobilePhone = c['Mobile Phone']
            outputStream.write(vCard.getFormattedString())
        })
        console.log(contactWithNumbers.length)
	});