feat: add hoistGlobalsAndWrapContext()

lib/hoistGlobalsAndWrapContext.js

@@ -0,0 +1,25 @@
+'use strict';
+
+module.exports = function(styles, selector) {
+    var global = {};
+
+    global[selector] = styles;
+
+    for (var key in styles) {
+        if (key[0] === '@') {
+            // At-rule.
+            if (key[1] === 'k') {
+                // @keyframes
+                global[key] = styles[key];
+            } else {
+                var obj = {};
+                obj[selector] = styles[key];
+                global[key] = obj;
+            }
+
+            delete styles[key];
+        }
+    }
+
+    return global;
+};