index.js

const ma = require('moving-average')(10000);
const log = (a)=>{ console.log(a); return a}
let run = true;

log(process.version)
function count(){
	const now = Date.now();
	return new Promise(function(res, rej){
		const vals = Array(9e4).fill('').map(_ => Math.random());
		vals.reduce((t,v) => {return t + v}, 0);
		res({time: Date.now() - now})
	});
}

function delay(){
	return new Promise(res => setTimeout(res.bind(null, ...arguments), 100))
}

function operate(){
	run = count()
	  // .then(log)
	  .then(delay)
	  .then(t => ma.push(Date.now(), t.time))
	  .then(function(){
	  	const doit = Date.now() % 10 == 0;
		if (doit) console.log(ma.movingAverage() << 0)
          })
	  .then(operate)
}

process.on('SIGINT', ()=>{
    run.then(()=>log('ending')).then(process.exit.bind(null, 0))
})

operate()

package.json

{
  "name": "ma",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "moving-average": "^0.1.1"
  }
}