message: [Build] use es entry file
diff: @@ -7,7 +7,7 @@ delete config.serve;
  module.exports = Object.assign(config, {
  mode: 'production',
  entry: {
  - 'vant': './packages/index.js'
  + 'vant': './es/index.js'
  },
  output: {
  path: path.join(__dirname, '../lib'),
  