feat(cli): build package

packages/vant-cli/src/config/webpack.site.prd.ts

@@ -1,8 +1,8 @@
 import { join } from 'path';
 import merge from 'webpack-merge';
-import config from './webpack.site.dev';
+import { siteDevConfig } from './webpack.site.dev';
 
-module.exports = merge(config, {
+export const sitePrdConfig = merge(siteDevConfig, {
   mode: 'production',
   output: {
     path: join(__dirname, '../../site/dist'),
@@ -11,5 +11,3 @@ module.exports = merge(config, {
     chunkFilename: 'async_[name].[chunkhash:8].js'
   }
 });
-
-export default module.exports;