webpack.config.js

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

module.exports = {
  entry: './index.js',
  output: {
    path: path.join(__dirname, 'dist'),
    filename: 'bundle.js',
    publicPath: '/dist/',
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel'
      }
    ]
  }
};

if (process.env.NODE_ENV === 'production') {
  module.exports.devtool = '#source-map'
  // http://vuejs.github.io/vue-loader/workflow/production.html
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    }),
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false
      }
    }),
    new webpack.optimize.OccurrenceOrderPlugin()
  ])
}