profile-promise.js

const runs = 10;

function run(method, runIndex) {
  console.time(`run ${runIndex}`);
  return method().then(() => {
    console.timeEnd(`run ${runIndex}`);
    if (runIndex < runs){
      return run(method, runIndex+1);
    }
  });
}

console.time('runs');
return run(() => {
 
  // Long running promise E.g:
  return new Promise((resolve, reject) => { setTimeout(resolve, 1000); });

}, 0)
.then(() => { console.timeEnd('runs'); })