feat(cli): add build-site command

packages/vant-cli/src/compiler/compile-package.ts

@@ -0,0 +1,14 @@
+import webpack from 'webpack';
+import { packageConfig } from '../config/webpack.package';
+
+export async function compilePackage(isMinify: boolean) {
+  return new Promise((resolve, reject) => {
+    webpack(packageConfig(isMinify), (err, stats) => {
+      if (err || stats.hasErrors()) {
+        reject();
+      } else {
+        resolve();
+      }
+    });
+  });
+}