feat(cli): find root dir

packages/vant-cli/src/config/webpack.base.ts

@@ -4,7 +4,7 @@ import sass from 'sass';
 import { resolve } from 'path';
 import { VueLoaderPlugin } from 'vue-loader';
 import {
-  CWD,
+  ROOT,
   STYLE_EXTS,
   SCRIPT_EXTS,
   POSTCSS_CONFIG_FILE
@@ -63,7 +63,7 @@ export const baseConfig = {
           {
             loader: 'less-loader',
             options: {
-              paths: [resolve(CWD, 'node_modules')]
+              paths: [resolve(ROOT, 'node_modules')]
             }
           }
         ]