funcunit/site/node_modules/steal/ext/css.js

<!-- @hide title

var loader = require("@loader");

if(isProduction()) {
	exports.fetch = function(load) {
		// return a thenable for fetching (as per specification)
		// alternatively return new Promise(function(resolve, reject) { ... })
		var cssFile = load.address;

		var link = document.createElement('link');
		link.rel = 'stylesheet';
		link.href = cssFile;

		document.head.appendChild(link);
		return "";
	};
} else {
	exports.instantiate = function(load) {
		var loader = this;

		load.metadata.deps = [];
		load.metadata.execute = function(){
			var source = load.source+"/*# sourceURL="+load.address+" */";
			source = source.replace(/url\(['"]?([^'"\)]*)['"]?\)/g, function(whole, part) {
				return "url(" + steal.joinURIs( load.address, part) + ")";
			});

			// Replace @import's that don't start with a "u" or "U" and do start
			// with a single or double quote with a path wrapped in "url()"
			// relative to the page
			source = source.replace(/@import [^uU]['"]?([^'"\)]*)['"]?/g, function(whole, part) {
				return "@import url(" + steal.joinURIs( load.address, part) + ")";
			});

			if(load.source && typeof document !== "undefined") {
				var doc = document.head ? document : document.getElementsByTagName ?
					document : document.documentElement;

				var head = doc.head || doc.getElementsByTagName('head')[0],
					style = document.createElement('style');

				if(!head) {
					var docEl = doc.documentElement || doc;
					head = document.createElement("head");
					docEl.insertBefore(head, docEl.firstChild);
				}

				// make source load relative to the current page
				style.type = 'text/css';

				if (style.styleSheet){
					style.styleSheet.cssText = source;
				} else {
					style.appendChild(document.createTextNode(source));
				}
				head.appendChild(style);

				if(loader.has("live-reload")) {
					var cssReload = loader["import"]("live-reload", { name: "$css" });
					Promise.resolve(cssReload).then(function(reload){
						loader["import"](load.name).then(function(){
							reload.once(load.name, function(){
								head.removeChild(style);
							});
						});
					});
				}
			}

			return System.newModule({source: source});
		};
		load.metadata.format = "css";
	};

}

function isProduction(){
	return (loader.isEnv && loader.isEnv("production")) ||
		loader.env === "production";
}
exports.locateScheme = true;
exports.buildType = "css";
exports.includeInBuild = true;