code: function setupFacebookGlobal() {
  	if ( window.fbq ) {
  		return;
  	}
  
  	const facebookEvents = ( window.fbq = function() {
  		if ( facebookEvents.callMethod ) {
  			facebookEvents.callMethod.apply( facebookEvents, arguments );
  		} else {
  			facebookEvents.queue.push( arguments );
  		}
  	} );
  
  	if ( ! window._fbq ) {
  		window._fbq = facebookEvents;
  	}
  
  	/*
  	 * Disable automatic PageView pushState tracking. It causes problems when we're using multiple FB pixel IDs.
  	 * The objective here is to avoid firing a PageView against multiple FB pixel IDs. By disabling pushState tracking,
  	 * we can do PageView tracking for FB on our own. See: `retarget()` in this file.
  	 *
  	 * There's more about the `disablePushState` flag here:
  	 * <https://developers.facebook.com/ads/blog/post/2017/05/29/tagging-a-single-page-application-facebook-pixel/>
  	 */
  	window._fbq.disablePushState = true;
  
  	facebookEvents.push = facebookEvents;
  	facebookEvents.loaded = true;
  	facebookEvents.version = '2.0';
  	facebookEvents.queue = [];
  }
docs: This sets up the globals that the Facebook event library expects.
  More info here: https://www.facebook.com/business/help/952192354843755