feat: allow composition

Author: streamich

.storybook/jsx.stories.js

@@ -35,6 +35,10 @@ const Button = jsx('button', {
     }
 });
 
+const ButtonYellow = jsx(Button, {
+    color: 'yellow'
+});
+
 storiesOf('jsx()', module)
     .add('Default', () =>
         h(RedBorder, null, 'Hello world')
@@ -50,3 +54,8 @@ storiesOf('jsx()', module)
             h(Button, null, 'Click me!')
         )
     )
+    .add('Composition', () =>
+        h(Block, null,
+            h(ButtonYellow, null, 'Click me!')
+        )
+    )

addon/extend.js

@@ -15,9 +15,6 @@ exports.addon = function (renderer) {
         var className;
         var isElement = typeof fn === 'string';
 
-        if (!block && !isElement)
-            block = fn.displayName || fn.name;
-
         var Component = function (props) {
             if (!className) {
                 className = renderer.rule(styles, block);