diff --git a/src/internal/baseIteratee.ts b/src/internal/baseIteratee.ts
index 1b5fbdf..88fda0c 100644
--- a/src/internal/baseIteratee.ts
+++ b/src/internal/baseIteratee.ts
@@ -8,6 +8,7 @@ import type {
     ObjectIterateeCustom,
     ObjectIterator,
     PropertyName,
+    ValueKeyIteratee,
 } from './baseIteratee.type'
 
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
@@ -52,9 +53,8 @@ function isMatch(element: unknown, source: unknown): boolean {
 
 export function baseIteratee<T, TResult>(iteratee: ObjectIterateeCustom<T, TResult>): ObjectIterator<T, TResult>
 export function baseIteratee<T, TResult>(iteratee: ListIterateeCustom<T, TResult>): ListIterator<T, TResult>
-export function baseIteratee<T, TResult>(
-    iteratee: ListIterateeCustom<T, TResult> | ObjectIterateeCustom<T, TResult>,
-): ListIterator<T, TResult> | ObjectIterator<T, TResult> {
+export function baseIteratee<T, TResult>(iteratee: ValueKeyIteratee<T>): ObjectIterator<T, TResult>
+export function baseIteratee<T, TResult>(iteratee: unknown) {
     if (iteratee == null) {
         return function (element: T) {
             return element as unknown as TResult
diff --git a/src/internal/baseIteratee.type.ts b/src/internal/baseIteratee.type.ts
index a7f44f2..329b43a 100644
--- a/src/internal/baseIteratee.type.ts
+++ b/src/internal/baseIteratee.type.ts
@@ -12,6 +12,8 @@ export type ListIterateeCustom<T, TResult> = ListIterator<T, TResult> | Iteratee
 export type ListIteratorTypeGuard<T, S extends T> = (value: T, index: number, collection: List<T>) => value is S
 
 export type ValueIteratee<T> = ((value: T) => unknown) | IterateeShorthand<T>
+export type ValueKeyIteratee<T> = ((value: T, key: string) => unknown) | IterateeShorthand<T>
+export type ValueKeyIterateeTypeGuard<T, S extends T> = (value: T, key: string) => value is S
 
 export type ObjectIterator<T, TResult> = (value: T[keyof T], key: string, collection: T) => TResult
 export type ObjectIteratee<TObject> = ObjectIterator<TObject, unknown> | IterateeShorthand<TObject[keyof TObject]>