diff --git a/packages/fineui/typescript/core/base.ts b/packages/fineui/typescript/core/base.ts
index e347747cf..1ff0d2868 100644
--- a/packages/fineui/typescript/core/base.ts
+++ b/packages/fineui/typescript/core/base.ts
@@ -1,3 +1,4 @@
+import { LodashDebounce } from 'lodash/fp';
 import { Widget } from "./widget";
 
 type UnionToIntersection<Union> = (
@@ -320,7 +321,14 @@ export declare function once(func: Function): Function;
 
 export declare function partial(func: Function, ...partials: any): Function;
 
-export declare function debounce<T extends Function>(func: T, wait?: number, options?: any): T;
+// from @types/lodash
+interface DebouncedFunc<T extends (...args: any[]) => any> {
+    (...args: Parameters<T>): ReturnType<T> | undefined;
+    cancel(): void;
+    flush(): ReturnType<T> | undefined;
+}
+
+export declare function debounce<T extends (...args: any[]) => any>(func: T, wait?: number, options?: any): DebouncedFunc<T>;
 
 export declare function throttle<T extends Function>(func: T, wait?: number, options?: any): T;