vant/build/webpack.build.min.js

var webpack = require('webpack');
var config = require('./webpack.build.js');

config.entry = {
  'index': './src/index.js'
};

config.plugins = config.plugins.concat([
  new webpack.optimize.UglifyJsPlugin({
    compress: {
      warnings: false
    },
    output: {
      comments: false
    },
    sourceMap: false
  })
]);

module.exports = config;