feat: implement drule()

README.md

@@ -2,8 +2,12 @@
 
 [![][npm-badge]][npm-url] [![][travis-badge]][travis-url]
 
-Super lite CSS-in-JS solution.
+Super lite CSS-in-JS solution at only __0.XKb__ packing more features than you will find in any other CSS-in-JS library.
 
+- Only __0.XKb__ minified and gzipped.
+- Library agnostic
+- Use with any virtual DOM library, not just React.
+- Isomorphic — render on server and browser.
 - Does not create wrapper components.
 
 

addon/drule.js

@@ -0,0 +1,23 @@
+'use strict';
+
+exports.addon = function (renderer) {
+    if (process.env.NODE_ENV !== 'production') {
+        require('./__dev__/warnOnMissingDependencies')('drule', renderer, ['rule']);
+    }
+
+    renderer.drule = function (styles, block) {
+        var className = renderer.rule(styles, block);
+
+        var closure = function (dynamicStyles) {
+            var dynamicClassName = renderer.cache(dynamicStyles);
+
+            return className + dynamicClassName;
+        };
+
+        closure.toString = function () {
+            return className;
+        };
+
+        return closure;
+    };
+};