workout/public/scripts/pixel.js

const PIXEL_ID = document.currentScript.getAttribute("data-pixel-id");

function initializeFacebookPixel(f, b, e, v, n, t, s) {
  if (f.fbq) return;
  n = f.fbq = function () {
    // eslint-disable-next-line
    n.callMethod ? n.callMethod.apply(n, arguments) : n.queue.push(arguments);
  };
  if (!f._fbq) f._fbq = n;
  n.push = n;
  n.loaded = !0;
  n.version = "2.0";
  n.queue = [];
  t = b.createElement(e);
  t.async = !0;
  t.src = v;
  s = b.getElementsByTagName(e)[0];
  s.parentNode.insertBefore(t, s);
}

initializeFacebookPixel(window, document, "script", "https://connect.facebook.net/en_US/fbevents.js");

window.fbq("init", PIXEL_ID);