ES6 event to trigger once per scroll

onScrollOnce.es6.js

function onScrollOnce(fn, scope) {
  let mw1 = 0,
    mw2 = 0;
  let lock;

  return function() {
    const context = scope || this;
    const args = arguments;
    const e = args[0];
    const d = e.deltaY;
    if (
      ((d > 0 && d < mw2 && mw2 > mw1) || (d < 0 && d > mw2 && mw2 < mw1)) &&
      !lock
    ) {
      fn.apply(context, args);
      lock = true;
      window.setTimeout(function() {
        lock = false;
      }, 200);
    }
    mw1 = mw2;
    mw2 = d;
  };
}

function onScroll(e) {
  consonle.log(e);
}

document.addEventListener('wheel', onScrollOnce(onScroll));