code: function getWeightOf(bundle) {
  	var isCss = bundle.buildType === "css";
  	var isMainBundle = bundle.bundles.length === 1;
  
  	if (isCss) {
  		return 1;
  	} else if (isMainBundle) {
  		return 2;
  	} else {
  		return 3;
  	}
  }
docs: A very simplified version of HTTP2 stream priorities
  Bundles with the lowest weight should be loaded first
  
  @param {Object} bundle - A bundle object
  @return {Number} 1 for css bundles, 2 for main JS bundles, 3 for shared bundles