Use of CommonsChunkPlugin on webpack

my_entry.jsx

import React from 'react';
import ReactDom from 'reactDom';

webpack.config.js

var CommonsChunkPlugin = require("webpack/lib/optimize/CommonsChunkPlugin");
var node_dir = __dirname + '/node_modules';

module.exports = {
    resolve: {
        alias: {
            react: node_dir + '/react',
            reactDom: node_dir + '/react-dom'
        }
    },
    entry: {
        vendors: ['react','reactDom'],
        my_entry: './my_entry.jsx'
    },
    output: {
        path: './my_output_path',
        filename: '[name].bundle.js'
    },
    plugins: [
        new CommonsChunkPlugin('vendors', 'common.js', Infinity)
    ],
    module: {
        loaders: [
            {
                test: /.jsx$/,
                loader: 'babel-loader',
                exclude: /node_modules/,
                query: {
                    presets: ['es2015', 'react', 'stage-2']
                }
            }
        ]
    }
};