[Build] revert site to webpack config (#3747)

build/webpack.dev.js

@@ -0,0 +1,87 @@
+const path = require('path');
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+const ProgressBarPlugin = require('progress-bar-webpack-plugin');
+const { VueLoaderPlugin } = require('vue-loader');
+
+module.exports = {
+  mode: 'development',
+  entry: {
+    'vant-docs': './docs/site/desktop/main.js',
+    'vant-mobile': './docs/site/mobile/main.js'
+  },
+  output: {
+    path: path.join(__dirname, '../docs/dist'),
+    publicPath: '/',
+    chunkFilename: 'async_[name].js'
+  },
+  stats: {
+    modules: false,
+    children: false
+  },
+  devServer: {
+    open: true,
+    host: '0.0.0.0',
+    stats: 'errors-only',
+    clientLogLevel: 'warning'
+  },
+  resolve: {
+    extensions: ['.js', '.ts', '.tsx', '.vue', '.less']
+  },
+  module: {
+    rules: [
+      {
+        test: /\.vue$/,
+        use: [
+          {
+            loader: 'vue-loader',
+            options: {
+              compilerOptions: {
+                preserveWhitespace: false
+              }
+            }
+          }
+        ]
+      },
+      {
+        test: /\.(js|ts|tsx)$/,
+        exclude: /node_modules/,
+        use: 'babel-loader'
+      },
+      {
+        test: /\.less$/,
+        sideEffects: true,
+        use: [
+          'style-loader',
+          'css-loader',
+          'postcss-loader',
+          {
+            loader: 'less-loader',
+            options: {
+              paths: [path.resolve(__dirname, 'node_modules')]
+            }
+          }
+        ]
+      },
+      {
+        test: /\.md$/,
+        use: ['vue-loader', '@vant/markdown-loader']
+      }
+    ]
+  },
+  plugins: [
+    new VueLoaderPlugin(),
+    new ProgressBarPlugin(),
+    new HtmlWebpackPlugin({
+      chunks: ['vant-docs'],
+      template: 'docs/site/desktop/index.html',
+      filename: 'index.html',
+      inject: true
+    }),
+    new HtmlWebpackPlugin({
+      chunks: ['vant-mobile'],
+      template: 'docs/site/mobile/index.html',
+      filename: 'mobile.html',
+      inject: true
+    })
+  ]
+};