index.js

const measurePromise = (p, cb) => {
  const elapsed = hirestime();
  p.then(() => cb(elapsed()));
  return p;
};

const measurePromiseFn = (fn, cb) =>
  (...args) => measurePromise(fn.apply(null, args), cb);

const measure = (metric, fn) =>
  measurePromiseFn(fn, (ms) => metrics.timing(metric, ms));
                /* or  partial(metrics.timing, metric) */