Load Raven async

gistfile1.js

(function (window, document, script, raven, el, first, loaded) {
  raven = [];
  window.onerror = function e(message, file, line, colno, ex) {
    if (loaded) {
      return;
    }
    raven.push([message, file, colno, ex]);
  };
  el = document.createElement(script);
  first = document.getElementsByTagName(script)[0];
  el.src = 'https://cdn.ravenjs.com/3.7.0/raven.min.js';
  el.onreadystatechange = el.onload = function() {
    if (loaded) {
      return;
    }
    loaded = true;
    Raven.config('<DSN>', {
      release: '<VERSION>',
    }).install();
    for (var i = 0; i < raven.length; i++) {
      var entry = raven[i];
      Raven.captureException(entry[4] || new Error(entry[0]), {
        extra: {
          file: entry[1],
          lineno: entry[2],
          colno: entry[3]
        }
      });
    }
  };
  first.parentNode.insertBefore(el, first);
})(window, document, 'script');

at this point the biggest help would be having traceKitWindowOnError as an exported function from raven, so something like could be done:

for (var i = 0; i < raven.length; i++) {
  Raven.traceKitWindowOnError.apply(Raven, raven[i]);     
}