Using a variable in more than 1 file - discord.js

Question

TL:DR - I need help using a variable in more than 1 file
Currently I have a bot that counts how many times the word ":p" has been used. It adds that number to the variable "numberofp". On a separate file I want to call the variable on an embed but it says numberofp is undefined. Code is below. If you would like more code just ask!
code for index.js
// variables
var numberofp = 0;
client.on('message', (message) => {
if(message.author.id = 714544589305806868){
if(message.content.includes(':p')){
numberofp = numberofp + 1;
console.log('Porsha_boy said :p, so far it has been sent this many times:', numberofp);
}
}
})
Code for embed
const db = require("quick.db")
const Discord = require('discord.js')
module.exports = {
name: 'rub',
description: 'a command that tells you what your ping is',
execute(message, args, Discord){
// Basic embed
var embed = new Discord.MessageEmbed()
.setAuthor(numberofp)
.setColor("#34BDE1")
console.log('working')
}
}

Answer 1

You need to export the variable to be visible from the module outside:
wordcounter.js
let counter = 0;
function increase(a = 1) {
counter += a;
}
function getCounter() {
return counter;
}
exports.increase = increase;
exports.getCounter = getCounter;
clientone.js
const wc = require('./wordcounter');
wc.increase();
wc.increase(2);
wc.increase(5);
clienttwo.js
const wc = require('./wordcounter');
wc.increase(1);
wc.increase(1);
wc.increase(5);
index.js
const wc = require('./wordcounter');
const c1 = require('./clientone');
const c2 = require('./clienttwo');
console.log(wc.getCounter());