diff --git a/packages/traffic/src/index.ts b/packages/traffic/src/index.ts
index 476eddeaaf..162ae741ed 100644
--- a/packages/traffic/src/index.ts
+++ b/packages/traffic/src/index.ts
@@ -4,7 +4,6 @@ export { TrafficScene };
 if (typeof window !== 'undefined') {
     // append GroupGLLayer on maptalks manually
     if (window.maptalks) {
-        // @ts-expect-error-error
         window.maptalks.TrafficScene = TrafficScene;
     }
 }
diff --git a/packages/traffic/src/types/global.d.ts b/packages/traffic/src/types/global.d.ts
new file mode 100644
index 0000000000..778ada018c
--- /dev/null
+++ b/packages/traffic/src/types/global.d.ts
@@ -0,0 +1,11 @@
+import TrafficScene from "../TrafficScene";
+
+declare global {
+    interface Window {
+        maptalks: {
+            TrafficScene: typeof TrafficScene;
+        };
+    }
+}
+
+export {};