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module.exports = {
  //...
  plugins:[
    new webpack.DefinePlugin({
      'process.env':{
        'NODE_ENV': JSON.stringify('production')
      }
    }),
    new webpack.optimize.UglifyJsPlugin({
      compress:{
        warnings: false
      }
    })
  ]
  //...
}

function cloneWithProps(child, props) {
  if (process.env.NODE_ENV !== 'production') {
    process.env.NODE_ENV !== 'production' ? warning(didDeprecatedWarn, 'cloneWithProps(...) is deprecated. ' + 'Please use React.cloneElement instead.') : undefined;
    didDeprecatedWarn = true;
    process.env.NODE_ENV !== 'production' ? warning(!child.ref, 'You are calling cloneWithProps() on a child with a ref. This is ' + 'dangerous because you\'re creating a new child which will not be ' + 'added as a ref to its parent.') : undefined;
  }

  var newProps = ReactPropTransferer.mergeProps(props, child.props);

  // Use `child.props.children` if it is provided.
  if (!newProps.hasOwnProperty(CHILDREN_PROP) && child.props.hasOwnProperty(CHILDREN_PROP)) {
    newProps.children = child.props.children;
  }

  // The current API doesn't retain _owner, which is why this
  // doesn't use ReactElement.cloneAndReplaceProps.
  return ReactElement.createElement(child.type, newProps);
}