Webpack Config - 'webpack -p' not working for JS/CSS in NPM modules

webpack.config.js

path = require('path');
webpack = require('webpack');

var config = {
    context: __dirname + "/app",
    entry: {
        javascript: "./app.js",
        html: "./index.html",
    },
    output: {
        filename: "app.js",
        path: __dirname + "/dist",
    },
    module: {
        loaders: [
            {
                test: /\.html$/,
                loader: "file?name=[name].[ext]",
            },
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loaders: ["react-hot", "babel-loader"],
            },
            {
                test: /\.css$/,
                loader: "style-loader!css-loader"
            },
        ],
    },
};

module.exports = config;