es6语法括号使这个简短，但无法理解

Question

我正在寻找一个库（反应可调整大小）。从来没有见过这种语法，而且我的google-fu很弱。

评论正在帮助我理解代码的作用，但语法是这样的，我真的不明白它是如何做到的。

// What we're doing here is getting the child of this element, and cloning it with this element's props.
// We are then defining its children as:
// Its original children (resizable's child's children), and
// A draggable handle.

return (0, _cloneElement2.default)(children, _extends({}, p, {
  className: className,
  children: [children.props.children, _react2.default.createElement(
    _reactDraggable.DraggableCore,
    _extends({}, draggableOpts, {
      key: 'resizableHandle',
      onStop: this.resizeHandler('onResizeStop'),
      onStart: this.resizeHandler('onResizeStart'),
      onDrag: this.resizeHandler('onResize')
    }),
    _react2.default.createElement('span', { className: 'react-resizable-handle' })
  )]
}));