refactor(@vant/cli): migrate to ESM package

packages/vant-cli/cjs/babel-preset-vue-ts.cjs

@@ -0,0 +1,26 @@
+/**
+ * @babel/preset-typescript 不支持编译 Vue 文件中的 ts 代码
+ * 通过手动添加 @babel/plugin-transform-typescript 的方式来解决这个问题
+ * see: https://github.com/babel/babel-loader/pull/738
+ */
+
+const { readFileSync } = require('fs');
+const { declare } = require('@babel/helper-plugin-utils');
+
+module.exports = declare(() => ({
+  overrides: [
+    {
+      test: (filePath) => {
+        if (/\.vue$/.test(filePath)) {
+          const template = readFileSync(filePath, { encoding: 'utf8' });
+          return (
+            template.includes('lang="ts"') || template.includes("lang='ts'")
+          );
+        }
+
+        return false;
+      },
+      plugins: [require('@babel/plugin-transform-typescript')],
+    },
+  ],
+}));