[Build] use vue-cli to build site (#3734)

build/webpack.config.js

@@ -0,0 +1,41 @@
+const path = require('path');
+
+const isMinify = process.argv.indexOf('-p') !== -1;
+
+module.exports = {
+  mode: 'production',
+  entry: {
+    vant: './es/index.js'
+  },
+  output: {
+    path: path.join(__dirname, '../lib'),
+    library: 'vant',
+    libraryTarget: 'umd',
+    filename: isMinify ? '[name].min.js' : '[name].js',
+    umdNamedDefine: true,
+    globalObject: 'this'
+  },
+  externals: {
+    vue: {
+      root: 'Vue',
+      commonjs: 'vue',
+      commonjs2: 'vue',
+      amd: 'vue'
+    }
+  },
+  optimization: {
+    minimize: isMinify
+  },
+  resolve: {
+    extensions: ['.js', '.ts', '.tsx']
+  },
+  module: {
+    rules: [
+      {
+        test: /\.(js|ts|tsx)$/,
+        exclude: /node_modules/,
+        use: 'babel-loader'
+      }
+    ]
+  }
+};