diff --git a/packages/core/lib/index.ts b/packages/core/lib/index.ts
index a94147084..44c86a9bf 100644
--- a/packages/core/lib/index.ts
+++ b/packages/core/lib/index.ts
@@ -57,9 +57,14 @@ export {
   formatThousand,
 } from './numbers';
 
+export {
+  mockState,
+} from './state';
+
 export type {
   GenericObject,
   Grow,
   GrowToSize,
   FixedArray,
+  StateContent,
 } from './types';
diff --git a/packages/react/lib/utils.test.ts b/packages/core/lib/state/index.test.ts
similarity index 86%
rename from packages/react/lib/utils.test.ts
rename to packages/core/lib/state/index.test.ts
index b2659edc5..2fad1534d 100644
--- a/packages/react/lib/utils.test.ts
+++ b/packages/core/lib/state/index.test.ts
@@ -1,6 +1,6 @@
-import { mockState } from './utils';
+import { mockState } from './';
 
-describe('react/utils', () => {
+describe('state', () => {
   describe('mockState(state, action)', () => {
     it('should merge state with action object to simulate setState', () => {
       expect(mockState({ foo: 'bar' }, { foo: 'test' }))
diff --git a/packages/core/lib/state/index.ts b/packages/core/lib/state/index.ts
new file mode 100644
index 000000000..712e8ebc3
--- /dev/null
+++ b/packages/core/lib/state/index.ts
@@ -0,0 +1,12 @@
+import type { StateContent } from '../types';
+
+/**
+ * mockState should be inside react package, but some external packages
+ * (like @poool/react-access) only depend on @junipero/core, so it will be
+ * here forever).
+ */
+export const mockState = <T extends StateContent>(
+  state: T,
+  action : ((prev: T) => T) | Partial<T>
+) => typeof action === 'function'
+    ? action(state) : ({ ...state, ...action as T });
diff --git a/packages/core/lib/types.ts b/packages/core/lib/types.ts
index 7995f8c00..29b27f79a 100644
--- a/packages/core/lib/types.ts
+++ b/packages/core/lib/types.ts
@@ -11,3 +11,11 @@ export type GrowToSize<T, A extends Array<T>, N extends number> = {
 }[A['length'] extends N ? 0 : 1];
 
 export type FixedArray<T, N extends number> = GrowToSize<T, [], N>;
+
+/**
+* Represents a state comming from useReducer.
+* Volontarily abstracted to allow any kind of state.
+*/
+export declare interface StateContent {
+  [key: string]: any;
+}
diff --git a/packages/react/lib/Calendar/index.tsx b/packages/react/lib/Calendar/index.tsx
index b92ab6f0e..115796254 100644
--- a/packages/react/lib/Calendar/index.tsx
+++ b/packages/react/lib/Calendar/index.tsx
@@ -15,10 +15,10 @@ import {
   subMonths,
   addMonths,
   getDaysInMonth,
+  mockState,
 } from '@junipero/core';
 
 import type { JuniperoRef, SpecialComponentPropsWithRef } from '../types';
-import { mockState } from '../utils';
 import { ArrowLeft, ArrowRight } from '../icons';
 
 export declare interface CalendarRef extends JuniperoRef {
diff --git a/packages/react/lib/CheckboxField/index.tsx b/packages/react/lib/CheckboxField/index.tsx
index f06a73c8f..50fff4bb5 100644
--- a/packages/react/lib/CheckboxField/index.tsx
+++ b/packages/react/lib/CheckboxField/index.tsx
@@ -7,14 +7,13 @@ import {
   useReducer,
   useRef,
 } from 'react';
-import { classNames } from '@junipero/core';
+import { classNames, mockState } from '@junipero/core';
 
 import type {
   FieldContent,
   JuniperoRef,
   SpecialComponentPropsWithRef,
 } from '../types';
-import { mockState } from '../utils';
 import { useFieldControl } from '../hooks';
 import { Check } from '../icons';
 
diff --git a/packages/react/lib/CodeField/index.tsx b/packages/react/lib/CodeField/index.tsx
index c93f91747..409d7aacd 100644
--- a/packages/react/lib/CodeField/index.tsx
+++ b/packages/react/lib/CodeField/index.tsx
@@ -9,14 +9,13 @@ import {
   useRef,
   useImperativeHandle,
 } from 'react';
-import { classNames } from '@junipero/core';
+import { classNames, mockState } from '@junipero/core';
 
 import type {
   FieldContent,
   JuniperoRef,
   SpecialComponentPropsWithRef,
 } from '../types';
-import { mockState } from '../utils';
 import { useFieldControl } from '../hooks';
 
 export declare interface CodeFieldRef extends JuniperoRef {
diff --git a/packages/react/lib/ColorField/index.tsx b/packages/react/lib/ColorField/index.tsx
index 3532810ed..367ffcc37 100644
--- a/packages/react/lib/ColorField/index.tsx
+++ b/packages/react/lib/ColorField/index.tsx
@@ -15,6 +15,7 @@ import {
   exists,
   stringifyColor,
   parseColor,
+  mockState,
 } from '@junipero/core';
 import { useEventListener } from '@junipero/hooks';
 
@@ -24,7 +25,6 @@ import type {
   SpecialComponentPropsWithRef,
 } from '../types';
 import type { TransitionProps } from '../Transition';
-import { mockState } from '../utils';
 import { useFieldControl } from '../hooks';
 import Dropdown, { type DropdownProps, type DropdownRef } from '../Dropdown';
 import DropdownToggle from '../DropdownToggle';
diff --git a/packages/react/lib/DateField/index.tsx b/packages/react/lib/DateField/index.tsx
index 5cc9177d0..ea2d06e04 100644
--- a/packages/react/lib/DateField/index.tsx
+++ b/packages/react/lib/DateField/index.tsx
@@ -9,7 +9,7 @@ import {
   useRef,
   useEffect,
 } from 'react';
-import { type FixedArray, classNames, exists } from '@junipero/core';
+import { type FixedArray, classNames, exists, mockState } from '@junipero/core';
 
 import type { TransitionProps } from '../Transition';
 import type {
@@ -17,7 +17,6 @@ import type {
   FieldContent,
   SpecialComponentPropsWithRef,
 } from '../types';
-import { mockState } from '../utils';
 import { useFieldControl } from '../hooks';
 import { Arrows, Remove, Time } from '../icons';
 import Dropdown, { type DropdownRef } from '../Dropdown';
diff --git a/packages/react/lib/Dropdown/index.tsx b/packages/react/lib/Dropdown/index.tsx
index 63c130457..62dc22d5d 100644
--- a/packages/react/lib/Dropdown/index.tsx
+++ b/packages/react/lib/Dropdown/index.tsx
@@ -7,7 +7,7 @@ import {
   useReducer,
   useEffect,
 } from 'react';
-import { classNames, omit } from '@junipero/core';
+import { classNames, omit, mockState } from '@junipero/core';
 import {
   type UseClickProps,
   type UseDismissProps,
@@ -30,7 +30,6 @@ import {
 
 import type { JuniperoRef, SpecialComponentPropsWithRef } from '../types';
 import { DropdownContext, type DropdownContextType } from '../contexts';
-import { mockState } from '../utils';
 
 export declare interface DropdownRef extends JuniperoRef {
   opened: boolean;
diff --git a/packages/react/lib/FieldControl/index.tsx b/packages/react/lib/FieldControl/index.tsx
index 1e50abbf3..81de6ef0d 100644
--- a/packages/react/lib/FieldControl/index.tsx
+++ b/packages/react/lib/FieldControl/index.tsx
@@ -1,7 +1,7 @@
 import { type ComponentPropsWithoutRef, useCallback, useReducer } from 'react';
+import { mockState } from '@junipero/core';
 
 import { type FieldContextType, FieldControlContext } from '../contexts';
-import { mockState } from '../utils';
 
 export declare interface FieldControlProps extends Omit<
   ComponentPropsWithoutRef<typeof FieldControlContext.Provider>, 'value'
diff --git a/packages/react/lib/List/index.tsx b/packages/react/lib/List/index.tsx
index 9def6508f..1080868d5 100644
--- a/packages/react/lib/List/index.tsx
+++ b/packages/react/lib/List/index.tsx
@@ -7,13 +7,12 @@ import {
   useMemo,
   useEffect,
 } from 'react';
-import { classNames } from '@junipero/core';
+import { classNames, mockState } from '@junipero/core';
 
 import type { JuniperoRef, SpecialComponentPropsWithRef } from '../types';
 import type { ListColumnObject } from '../ListColumn';
 import { ListContext, type ListContextType } from '../contexts';
 import { ArrowDown, ArrowUp } from '../icons';
-import { mockState } from '../utils';
 
 export declare interface ListRef extends JuniperoRef {
   orderable: boolean;
diff --git a/packages/react/lib/Modal/index.tsx b/packages/react/lib/Modal/index.tsx
index d9c3a7eb1..621c3b4b6 100644
--- a/packages/react/lib/Modal/index.tsx
+++ b/packages/react/lib/Modal/index.tsx
@@ -9,12 +9,11 @@ import {
   useRef,
 } from 'react';
 import { createPortal } from 'react-dom';
-import { classNames, ensureNode } from '@junipero/core';
+import { classNames, ensureNode, mockState } from '@junipero/core';
 
 import type { JuniperoRef, SpecialComponentPropsWithRef } from '../types';
 import type { TransitionProps } from '../Transition';
 import { useModal } from '../hooks';
-import { mockState } from '../utils';
 import { Remove } from '../icons';
 
 export declare interface ModalRef extends JuniperoRef {
diff --git a/packages/react/lib/RadioField/index.tsx b/packages/react/lib/RadioField/index.tsx
index cafdf9fa8..81f2df2fa 100644
--- a/packages/react/lib/RadioField/index.tsx
+++ b/packages/react/lib/RadioField/index.tsx
@@ -6,14 +6,13 @@ import {
   useImperativeHandle,
   useEffect,
 } from 'react';
-import { classNames } from '@junipero/core';
+import { classNames, mockState } from '@junipero/core';
 
 import type {
   FieldContent,
   JuniperoRef,
   SpecialComponentPropsWithRef,
 } from '../types';
-import { mockState } from '../utils';
 import { useFieldControl } from '../hooks';
 
 export declare type RadioFieldValue = any;
diff --git a/packages/react/lib/SelectField/index.test.tsx b/packages/react/lib/SelectField/index.test.tsx
index fc74e5db8..a8dfb5ec7 100644
--- a/packages/react/lib/SelectField/index.test.tsx
+++ b/packages/react/lib/SelectField/index.test.tsx
@@ -1,12 +1,12 @@
 import { createRef, useEffect, useReducer, useState } from 'react';
 import { render, fireEvent, act } from '@testing-library/react';
 import { configMocks, mockIntersectionObserver } from 'jsdom-testing-mocks';
+import { mockState } from '@junipero/core';
 import userEvent from '@testing-library/user-event';
 
 import { blur, focus, reset, sleep } from '~tests-utils';
 import type { FieldContent } from '../types';
 import { cloneDeep, set } from '../../../core/lib/core';
-import { mockState } from '../utils';
 import FieldControl from '../FieldControl';
 import Label from '../Label';
 import Abstract from '../Abstract';
diff --git a/packages/react/lib/SelectField/index.tsx b/packages/react/lib/SelectField/index.tsx
index 368761abd..acbb7952b 100644
--- a/packages/react/lib/SelectField/index.tsx
+++ b/packages/react/lib/SelectField/index.tsx
@@ -17,6 +17,7 @@ import {
   exists,
   filterDeep,
   findDeep,
+  mockState,
 } from '@junipero/core';
 import { useTimeout } from '@junipero/hooks';
 
@@ -28,7 +29,6 @@ import type {
 import type { TransitionProps } from '../Transition';
 import { useFieldControl } from '../hooks';
 import { Arrows, Remove } from '../icons';
-import { mockState } from '../utils';
 import Dropdown, { type DropdownRef } from '../Dropdown';
 import DropdownToggle from '../DropdownToggle';
 import DropdownMenu from '../DropdownMenu';
diff --git a/packages/react/lib/Slider/index.tsx b/packages/react/lib/Slider/index.tsx
index b3b057fc4..7c378b33c 100644
--- a/packages/react/lib/Slider/index.tsx
+++ b/packages/react/lib/Slider/index.tsx
@@ -12,12 +12,12 @@ import {
   classNames,
   getFloatPrecision,
   ensureMinMax,
+  mockState,
 } from '@junipero/core';
 import { useEventListener } from '@junipero/hooks';
 
 import type { JuniperoRef, SpecialComponentPropsWithRef } from '../types';
 import type { TransitionProps } from '../Transition';
-import { mockState } from '../utils';
 import Tooltip, { type TooltipRef } from '../Tooltip';
 
 export declare interface SliderRef extends JuniperoRef {
diff --git a/packages/react/lib/Tabs/index.tsx b/packages/react/lib/Tabs/index.tsx
index f392b091e..e1469deee 100644
--- a/packages/react/lib/Tabs/index.tsx
+++ b/packages/react/lib/Tabs/index.tsx
@@ -3,6 +3,7 @@ import {
   type ReactNode,
   type MouseEvent,
   type ReactElement,
+  type ComponentPropsWithoutRef,
   Children,
   useEffect,
   useImperativeHandle,
@@ -13,7 +14,7 @@ import {
 import { classNames } from '@junipero/core';
 
 import type { JuniperoRef, SpecialComponentPropsWithRef } from '../types';
-import Tab, { TabProps, type TabObject } from '../Tab';
+import Tab, { type TabProps, type TabObject } from '../Tab';
 
 export declare interface TabsRef extends JuniperoRef {
   activeTab: number;
@@ -28,7 +29,7 @@ export declare interface TabsProps extends Omit<
   active?: number;
   disabled?: boolean;
   tabs?: Array<TabObject>;
-  filterTab?(child: ReactElement | ReactNode): boolean;
+  filterTab?(child: ReactElement<ComponentPropsWithoutRef<any>>): boolean;
   onToggle?(index: number): void;
 }
 
@@ -39,7 +40,7 @@ const Tabs = ({
   active,
   tabs,
   disabled = false,
-  filterTab = (child: ReactElement) =>
+  filterTab = (child: ReactElement<ComponentPropsWithoutRef<any>>) =>
     typeof child !== 'string' && child.type === Tab,
   onToggle,
   ...rest
diff --git a/packages/react/lib/TextField/index.tsx b/packages/react/lib/TextField/index.tsx
index 93fc422e3..9194a1217 100644
--- a/packages/react/lib/TextField/index.tsx
+++ b/packages/react/lib/TextField/index.tsx
@@ -8,14 +8,13 @@ import {
   useReducer,
   useRef,
 } from 'react';
-import { classNames, exists } from '@junipero/core';
+import { classNames, exists, mockState } from '@junipero/core';
 
 import type {
   FieldContent,
   JuniperoRef,
   SpecialComponentPropsWithRef,
 } from '../types';
-import { mockState } from '../utils';
 import { useFieldControl } from '../hooks';
 
 export declare interface TextFieldRef extends JuniperoRef {
diff --git a/packages/react/lib/Toggle/index.tsx b/packages/react/lib/Toggle/index.tsx
index 711e0f7b1..0fdbc2227 100644
--- a/packages/react/lib/Toggle/index.tsx
+++ b/packages/react/lib/Toggle/index.tsx
@@ -6,14 +6,13 @@ import {
   useReducer,
   useRef,
 } from 'react';
-import { classNames } from '@junipero/core';
+import { classNames, mockState } from '@junipero/core';
 
 import type {
   FieldContent,
   JuniperoRef,
   SpecialComponentPropsWithRef,
 } from '../types';
-import { mockState } from '../utils';
 
 export declare type ToggleValue = any;
 
diff --git a/packages/react/lib/Tooltip/index.tsx b/packages/react/lib/Tooltip/index.tsx
index e3e5b23dc..e83694a7d 100644
--- a/packages/react/lib/Tooltip/index.tsx
+++ b/packages/react/lib/Tooltip/index.tsx
@@ -15,6 +15,7 @@ import {
   classNames,
   ensureNode,
   omit,
+  mockState,
 } from '@junipero/core';
 import {
   type UseDismissProps,
@@ -41,7 +42,6 @@ import type {
   SpecialComponentPropsWithRef,
 } from '../types';
 import type { TransitionProps } from '../Transition';
-import { mockState } from '../utils';
 
 export declare interface TooltipRef extends JuniperoRef {
   opened: boolean;
diff --git a/packages/react/lib/Transition/index.stories.tsx b/packages/react/lib/Transition/index.stories.tsx
index dc71f14fd..e474f51ec 100644
--- a/packages/react/lib/Transition/index.stories.tsx
+++ b/packages/react/lib/Transition/index.stories.tsx
@@ -1,7 +1,7 @@
 import { useReducer } from 'react';
+import { mockState } from '@junipero/core';
 
 import type { FieldContent } from '../types';
-import { mockState } from '../utils';
 import Button from '../Button';
 import Label from '../Label';
 import TextField from '../TextField';
diff --git a/packages/react/lib/index.test.tsx b/packages/react/lib/index.test.tsx
index e256ef031..a554f4081 100644
--- a/packages/react/lib/index.test.tsx
+++ b/packages/react/lib/index.test.tsx
@@ -1,9 +1,9 @@
 import { useReducer } from 'react';
 import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import { mockState } from '@junipero/core';
 import { useTimeout } from '@junipero/hooks';
 
 import type { FieldContent } from './types';
-import { mockState } from './utils';
 import TextField from './TextField';
 
 type State = {
diff --git a/packages/react/lib/index.ts b/packages/react/lib/index.ts
index 80689918c..a85858125 100644
--- a/packages/react/lib/index.ts
+++ b/packages/react/lib/index.ts
@@ -2,6 +2,7 @@ export {
   type Grow,
   type GrowToSize,
   type FixedArray,
+  type StateContent,
   COLORS,
   ensureNode,
   classNames,
@@ -46,6 +47,7 @@ export {
   ensureMinMax,
   getFloatPrecision,
   formatThousand,
+  mockState,
 } from '@junipero/core';
 
 export {
@@ -375,8 +377,4 @@ export {
   type ModalContextType,
 } from './contexts';
 
-export {
-  mockState,
-} from './utils';
-
 export type * from './types';
diff --git a/packages/react/lib/utils.ts b/packages/react/lib/utils.ts
deleted file mode 100644
index 27e34ad11..000000000
--- a/packages/react/lib/utils.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import type { StateContent } from './types';
-
-export const mockState = <T extends StateContent>(
-  state: T,
-  action : ((prev: T) => T) | Partial<T>
-) => typeof action === 'function'
-    ? action(state) : ({ ...state, ...action as T });