Webpack -p doesn't create bundle correctly - reactjs

Question

I started learning React by myself and I decided to create a boilerplate for me. I'm getting a problem to build a project using webpack. When I run in dev mode, works fine. When I run the command 'postinstall' to build for production, it generates a bundle.js with only a few bytes. But when I run the 'postinstall' without the parameter -p, it generates my bundle with ~ 2MB, the same thing when generates for dev mode (obviously because is not set for production). I didn't figure out why the production flag isn't creating my bundle correct. Can someone help me with this problem?
The project is in the repository:
https://github.com/ribeiroguilherme/react-boilerplate-dashboard
The webpack.production.config.js file:
const webpack = require('webpack');
const path = require('path');
const ExtractPlugin = require('extract-text-webpack-plugin');
const CleanPlugin = require('clean-webpack-plugin');
const plugins = [
new CleanPlugin('dist'),
new ExtractPlugin('bundle.css'),
new webpack.optimize.DedupePlugin(),
new webpack.optimize.UglifyJsPlugin({ minimize: true }),
new webpack.optimize.AggressiveMergingPlugin(),
new webpack.DefinePlugin({
'process.env': {
NODE_ENV: JSON.stringify('production'),
},
}),
];
module.exports = {
devtool: 'eval',
debug: false,
context: __dirname + '/src/client',
entry: {
javascript: './index.jsx',
html: './index.html',
},
output: {
filename: 'bundle.js',
path: __dirname + '/dist',
},
resolve: {
extensions: ['', '.js', '.jsx', '.json'],
root: path.resolve(__dirname, './src/client'),
},
eslint: {
configFile: './.eslintrc',
},
module: {
preLoaders: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: 'eslint-loader',
},
],
loaders: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loaders: ['babel-loader'],
},
{
test: /\.html$/,
loader: 'file?name=[name].[ext]',
},
{
test: /\.css$/,
loader: ExtractPlugin.extract('style-loader', 'css-loader'),
},
],
},
plugins: plugins,
};
I'm also worried because the bundle looks pretty big for a project that I just started now. Any hints will be very appreciated.
Best Regards