fix #217 for functional components (#235)

Revert "fix: Make `styles` property always not enumerable"

This reverts commit f2e1bee.

src/wrapStatelessFunction.js

@@ -12,23 +12,23 @@ export default (Component: Function, defaultStyles: Object, options: Object): Fu
  const WrappedComponent = (props = {}, ...args) => {
  let styles;
  let useProps;
+ const hasDefaultstyles = _.isObject(defaultStyles);
 
- if (props.styles) {
- useProps = props;
- styles = props.styles;
- } else if (_.isObject(defaultStyles)) {
- useProps = _.assign({}, props, {
- styles: defaultStyles
- });
+ if (props.styles || hasDefaultstyles) {
+ useProps = Object.assign({}, props);
+
+ if (props.styles) {
+ styles = props.styles;
+ } else {
+ styles = defaultStyles;
+ }
 
  Object.defineProperty(useProps, 'styles', {
  configurable: true,
  enumerable: false,
- value: defaultStyles,
+ value: styles,
  writable: false
  });
-
- styles = defaultStyles;
  } else {
  useProps = props;
  styles = {};