diff --git a/components/lib/passthrough/index.d.ts b/components/lib/passthrough/index.d.ts
index e69de29bb..eaee6b5c0 100644
--- a/components/lib/passthrough/index.d.ts
+++ b/components/lib/passthrough/index.d.ts
@@ -0,0 +1,15 @@
+export interface CustomizerOptions {
+    key?: string | undefined;
+    to?: object | undefined;
+    from?: object | undefined;
+    value?: any;
+}
+
+export interface usePassThroughOptions {
+    merge?: boolean | undefined;
+    useMergeProps?: boolean | undefined;
+    ignoredKeysOnMerge?: string[] | undefined;
+    customizer?: ((options?: CustomizerOptions) => any) | undefined;
+}
+
+export declare function usePassThrough(pt1: object, pt2: object, options?: usePassThroughOptions): object;
diff --git a/components/lib/utils/Utils.d.ts b/components/lib/utils/Utils.d.ts
index fcff75af3..52ae4ade3 100644
--- a/components/lib/utils/Utils.d.ts
+++ b/components/lib/utils/Utils.d.ts
@@ -88,6 +88,7 @@ export declare class ObjectUtils {
     static isPrintableCharacter(char: string): boolean;
     static findLast(value: any[], callback: () => any): any;
     static findLastIndex(value: any[], callback: () => any): number;
+    static nestedKeys(obj: object, parentKey?: string): string[];
 }
 
 export declare namespace ZIndexUtils {