first

js

var webpack = require("webpack");
var path = require("path");

module.exports = {
    entry: {
        app: './src/app.js'
    },
    output: {
        filename: 'public/build/bundle.js',
        sourceMapFilename: 'public/build/bundle.map'
    },
    devtool: '#source-map',
    module: {
        loaders: [
            {   test: /\.jsx?$/,
                exclude: /(node_modules)/,
                loader: 'babel',
                query: {
                    presets: ['stage-0','react','es2015'],
                    plugins: ["transform-class-properties","transform-decorators-legacy"]
                }
            }
        ]
    }
};