diff --git a/packages/vant-popperjs/rollup.config.js b/packages/vant-popperjs/rollup.config.js
index 162b32861..2a4f45f35 100644
--- a/packages/vant-popperjs/rollup.config.js
+++ b/packages/vant-popperjs/rollup.config.js
@@ -14,5 +14,8 @@ export default {
       format: 'esm',
     },
   ],
-  plugins: [nodeResolve(), babel({ babelHelpers: 'runtime' })],
+  plugins: [
+    babel({ babelHelpers: 'runtime', extensions: ['.js', '.ts'] }),
+    nodeResolve(),
+  ],
 };
diff --git a/packages/vant-popperjs/src/index.ts b/packages/vant-popperjs/src/index.ts
index bc3f0ded6..76cb8bd92 100644
--- a/packages/vant-popperjs/src/index.ts
+++ b/packages/vant-popperjs/src/index.ts
@@ -1,4 +1,6 @@
 import { createPopper } from '@popperjs/core/lib/popper-lite';
 import offsetModifier from '@popperjs/core/lib/modifiers/offset';
+import type { Instance, Placement } from '@popperjs/core';
 
 export { createPopper, offsetModifier };
+export type { Instance, Placement };