feat: add sheet() addon

addon/sheet.js

@@ -0,0 +1,32 @@
+'use strict';
+
+var hash = require('../lib/hash').hash;
+
+exports.addonSheet = function (renderer) {
+    renderer.sheet = function (map, block) {
+        var result = {};
+
+        if (!block) {
+            block = hash(map);
+        }
+
+        for (var elementModifier in map) {
+            var styles = map[elementModifier];
+
+            Object.defineProperty(result, elementModifier, {
+                configurable: true,
+                get: function () {
+                    var classNames = this.rule(styles, block + '-' + elementModifier);
+
+                    Object.defineProperty(result, elementModifier, {
+                        value: classNames,
+                    });
+
+                    return classNames;
+                },
+            });
+        }
+
+        return result;
+    };
+};

lib/index.js

@@ -8,6 +8,7 @@ var isClient = typeof window === 'object';
 
 exports.create = function (h) {
     var renderer = {
+        h: h,
         raw: '',
         cns: {},
         pfx: '_',