diff --git a/packages/src/context/context.ts b/packages/src/context/context.ts
index ce99b3c..854cc5e 100644
--- a/packages/src/context/context.ts
+++ b/packages/src/context/context.ts
@@ -1,12 +1,13 @@
-import { type OverlayData } from './store';
+import { type OverlayState } from './store';
 import { createSafeContext } from '../utils/create-safe-context';
 
-export const [OverlayContextProvider, useOverlayContext] = createSafeContext<OverlayData>('overlay-kit/OverlayContext');
+export const [OverlayContextProvider, useOverlayContext] =
+  createSafeContext<OverlayState>('overlay-kit/OverlayContext');
 
-export function useCurrentOverlay() {
-  return useOverlayContext().current;
+export function useOverlayCurrentId() {
+  return useOverlayContext().currentId;
 }
 
 export function useOverlayData() {
-  return useOverlayContext().overlayData;
+  return useOverlayContext().data;
 }
diff --git a/packages/src/context/index.ts b/packages/src/context/index.ts
index 8d6608c..14ba617 100644
--- a/packages/src/context/index.ts
+++ b/packages/src/context/index.ts
@@ -1,2 +1,2 @@
 export { OverlayProvider } from './provider';
-export { useCurrentOverlay, useOverlayData } from './context';
+export { useOverlayCurrentId, useOverlayData } from './context';
diff --git a/packages/src/context/provider.tsx b/packages/src/context/provider.tsx
index 7847b32..a01ee2f 100644
--- a/packages/src/context/provider.tsx
+++ b/packages/src/context/provider.tsx
@@ -1,6 +1,6 @@
 import { type FC, useEffect, useRef, type PropsWithChildren } from 'react';
 import { OverlayContextProvider } from './context';
-import { dispatchOverlay } from './store';
+import { type OverlayItem, dispatchOverlay } from './store';
 import { useSyncOverlayStore } from './use-sync-overlay-store';
 import { overlay } from '../event';
 
@@ -16,22 +16,22 @@ export function OverlayProvider({ children }: PropsWithChildren) {
   return (
     <OverlayContextProvider value={overlayState}>
       {children}
-      {overlayState.overlayOrderList.map((item) => {
-        const { id: currentOverlayId, isOpen, controller: currentController } = overlayState.overlayData[item];
+      {overlayState.orderIds.map((orderId) => {
+        const { id: currentId, isOpen, controller: currentController } = overlayState.data[orderId];
 
         return (
           <ContentOverlayController
-            key={currentOverlayId}
+            key={currentId}
             isOpen={isOpen}
-            current={overlayState.current}
-            overlayId={currentOverlayId}
+            currentId={overlayState.currentId}
+            overlayId={currentId}
             onMounted={() => {
               requestAnimationFrame(() => {
-                dispatchOverlay({ type: 'OPEN', overlayId: currentOverlayId });
+                dispatchOverlay({ type: 'OPEN', overlayId: currentId });
               });
             }}
-            onCloseModal={() => overlay.close(currentOverlayId)}
-            onExitModal={() => overlay.unmount(currentOverlayId)}
+            onCloseModal={() => overlay.close(currentId)}
+            onExitModal={() => overlay.unmount(currentId)}
             controller={currentController}
           />
         );
@@ -56,8 +56,8 @@ export type OverlayAsyncControllerComponent<T> = FC<OverlayAsyncControllerProps<
 
 type ContentOverlayControllerProps = {
   isOpen: boolean;
-  current: string | null;
-  overlayId: string;
+  currentId: OverlayItem['id'] | null;
+  overlayId: OverlayItem['id'];
   onMounted: () => void;
   onCloseModal: () => void;
   onExitModal: () => void;
@@ -66,23 +66,23 @@ type ContentOverlayControllerProps = {
 
 function ContentOverlayController({
   isOpen,
-  current,
+  currentId,
   overlayId,
   onMounted,
   onCloseModal,
   onExitModal,
   controller: Controller,
 }: ContentOverlayControllerProps) {
-  const prevCurrent = useRef(current);
+  const prevCurrentId = useRef(currentId);
   const onMountedRef = useRef(onMounted);
 
   /**
    * @description Executes when closing and reopening an overlay without unmounting.
    */
-  if (prevCurrent.current !== current) {
-    prevCurrent.current = current;
+  if (prevCurrentId.current !== currentId) {
+    prevCurrentId.current = currentId;
 
-    if (current === overlayId) {
+    if (currentId === overlayId) {
       onMountedRef.current();
     }
   }
diff --git a/packages/src/context/reducer.ts b/packages/src/context/reducer.ts
index 53b462e..4df38b2 100644
--- a/packages/src/context/reducer.ts
+++ b/packages/src/context/reducer.ts
@@ -1,32 +1,32 @@
-import { type OverlayData, type OverlayItem } from './store';
+import { type OverlayState, type OverlayItem } from './store';
 
 export type OverlayReducerAction =
   | { type: 'ADD'; overlay: OverlayItem }
-  | { type: 'OPEN'; overlayId: string }
-  | { type: 'CLOSE'; overlayId: string }
-  | { type: 'REMOVE'; overlayId: string }
+  | { type: 'OPEN'; overlayId: OverlayItem['id'] }
+  | { type: 'CLOSE'; overlayId: OverlayItem['id'] }
+  | { type: 'REMOVE'; overlayId: OverlayItem['id'] }
   | { type: 'CLOSE_ALL' }
   | { type: 'REMOVE_ALL' };
 
-export function overlayReducer(state: OverlayData, action: OverlayReducerAction): OverlayData {
+export function overlayReducer(state: OverlayState, action: OverlayReducerAction): OverlayState {
   switch (action.type) {
     case 'ADD': {
-      const isExisted = state.overlayOrderList.includes(action.overlay.id);
+      const isExisted = state.orderIds.includes(action.overlay.id);
 
-      if (isExisted && state.overlayData[action.overlay.id].isOpen === true) {
+      if (isExisted && state.data[action.overlay.id].isOpen === true) {
         throw new Error("You can't open the multiple overlays with the same overlayId. Please set a different id.");
       }
 
       return {
-        current: action.overlay.id,
+        currentId: action.overlay.id,
         /**
          * @description Brings the overlay to the front when reopened after closing without unmounting.
          */
-        overlayOrderList: [...state.overlayOrderList.filter((item) => item !== action.overlay.id), action.overlay.id],
-        overlayData: isExisted
-          ? state.overlayData
+        orderIds: [...state.orderIds.filter((orderId) => orderId !== action.overlay.id), action.overlay.id],
+        data: isExisted
+          ? state.data
           : {
-              ...state.overlayData,
+              ...state.data,
               [action.overlay.id]: action.overlay,
             },
       };
@@ -34,20 +34,18 @@ export function overlayReducer(state: OverlayData, action: OverlayReducerAction)
     case 'OPEN': {
       return {
         ...state,
-        overlayData: {
-          ...state.overlayData,
+        data: {
+          ...state.data,
           [action.overlayId]: {
-            ...state.overlayData[action.overlayId],
+            ...state.data[action.overlayId],
             isOpen: true,
           },
         },
       };
     }
     case 'CLOSE': {
-      const openedOverlayOrderList = state.overlayOrderList.filter(
-        (orderedOverlayId) => state.overlayData[orderedOverlayId].isOpen === true
-      );
-      const targetIndexInOpenedList = openedOverlayOrderList.findIndex((item) => item === action.overlayId);
+      const openedOrderIds = state.orderIds.filter((orderId) => state.data[orderId].isOpen === true);
+      const targetOpenedOrderIdIndex = openedOrderIds.findIndex((openedOrderId) => openedOrderId === action.overlayId);
 
       /**
        * @description If closing the last overlay, specify the overlay before it.
@@ -60,60 +58,60 @@ export function overlayReducer(state: OverlayData, action: OverlayReducerAction)
        * close 1 => current: null
        */
       const currentOverlayId =
-        targetIndexInOpenedList === openedOverlayOrderList.length - 1
-          ? openedOverlayOrderList[targetIndexInOpenedList - 1] ?? null
-          : openedOverlayOrderList.at(-1) ?? null;
+        targetOpenedOrderIdIndex === openedOrderIds.length - 1
+          ? openedOrderIds[targetOpenedOrderIdIndex - 1] ?? null
+          : openedOrderIds.at(-1) ?? null;
 
       return {
         ...state,
-        current: currentOverlayId,
-        overlayData: {
-          ...state.overlayData,
+        currentId: currentOverlayId,
+        data: {
+          ...state.data,
           [action.overlayId]: {
-            ...state.overlayData[action.overlayId],
+            ...state.data[action.overlayId],
             isOpen: false,
           },
         },
       };
     }
     case 'REMOVE': {
-      const remainingOverlays = state.overlayOrderList.filter((item) => item !== action.overlayId);
-      if (state.overlayOrderList.length === remainingOverlays.length) {
+      const remainingOrderIds = state.orderIds.filter((orderId) => orderId !== action.overlayId);
+      if (state.orderIds.length === remainingOrderIds.length) {
         return state;
       }
 
-      const copiedOverlayData = { ...state.overlayData };
-      delete copiedOverlayData[action.overlayId];
+      const copiedData = { ...state.data };
+      delete copiedData[action.overlayId];
 
-      const current = state.current
-        ? remainingOverlays.includes(state.current)
+      const currentId = state.currentId
+        ? remainingOrderIds.includes(state.currentId)
           ? /**
              * @description If `unmount` was executed after `close`
              */
-            state.current
+            state.currentId
           : /**
-             * @description If you only run `unmount`, there is no `current` in `remainingOverlays`
+             * @description If you only run `unmount`, there is no `currentId` in `remainingOrderIds`
              */
-            remainingOverlays.at(-1) ?? null
+            remainingOrderIds.at(-1) ?? null
         : /**
-           * @description The case where `current` is `null`
+           * @description The case where `currentId` is `null`
            */
           null;
 
       return {
-        current,
-        overlayOrderList: remainingOverlays,
-        overlayData: copiedOverlayData,
+        currentId,
+        orderIds: remainingOrderIds,
+        data: copiedData,
       };
     }
     case 'CLOSE_ALL': {
       return {
         ...state,
-        overlayData: Object.keys(state.overlayData).reduce(
+        data: Object.keys(state.data).reduce(
           (prev, curr) => ({
             ...prev,
             [curr]: {
-              ...state.overlayData[curr],
+              ...state.data[curr],
               isOpen: false,
             } satisfies OverlayItem,
           }),
@@ -122,7 +120,7 @@ export function overlayReducer(state: OverlayData, action: OverlayReducerAction)
       };
     }
     case 'REMOVE_ALL': {
-      return { current: null, overlayOrderList: [], overlayData: {} };
+      return { currentId: null, orderIds: [], data: {} };
     }
   }
 }
diff --git a/packages/src/context/store.ts b/packages/src/context/store.ts
index 1991322..d836f9a 100644
--- a/packages/src/context/store.ts
+++ b/packages/src/context/store.ts
@@ -1,22 +1,22 @@
 import { type OverlayControllerComponent } from './provider';
 import { type OverlayReducerAction, overlayReducer } from './reducer';
 
-type OverlayId = string;
+type OverlayItemId = string;
 export type OverlayItem = {
-  id: OverlayId;
+  id: OverlayItemId;
   isOpen: boolean;
   controller: OverlayControllerComponent;
 };
-export type OverlayData = {
-  current: OverlayId | null;
-  overlayOrderList: OverlayId[];
-  overlayData: Record<OverlayId, OverlayItem>;
+export type OverlayState = {
+  currentId: OverlayItemId | null;
+  orderIds: OverlayItemId[];
+  data: Record<OverlayItemId, OverlayItem>;
 };
 
-let overlays: OverlayData = {
-  current: null,
-  overlayOrderList: [],
-  overlayData: {},
+let overlays: OverlayState = {
+  currentId: null,
+  orderIds: [],
+  data: {},
 };
 let listeners: Array<() => void> = [];
 
@@ -34,7 +34,7 @@ export function dispatchOverlay(action: OverlayReducerAction) {
 /**
  * @description for useSyncExternalStorage
  */
-export const registerOverlaysStore = {
+export const registerOverlayStore = {
   subscribe(listener: () => void) {
     listeners = [...listeners, listener];
 
diff --git a/packages/src/context/use-sync-overlay-store.ts b/packages/src/context/use-sync-overlay-store.ts
index d7c4e5d..b50bd93 100644
--- a/packages/src/context/use-sync-overlay-store.ts
+++ b/packages/src/context/use-sync-overlay-store.ts
@@ -1,7 +1,7 @@
 import { useSyncExternalStore } from 'use-sync-external-store/shim/index.js';
-import { registerOverlaysStore } from './store';
+import { registerOverlayStore } from './store';
 
 export function useSyncOverlayStore() {
-  const { subscribe, getSnapshot } = registerOverlaysStore;
+  const { subscribe, getSnapshot } = registerOverlayStore;
   return useSyncExternalStore(subscribe, getSnapshot, getSnapshot);
 }
diff --git a/packages/src/event.ts b/packages/src/event.ts
index 2e1dd40..2a540c2 100644
--- a/packages/src/event.ts
+++ b/packages/src/event.ts
@@ -1,9 +1,9 @@
 import { type OverlayAsyncControllerComponent, type OverlayControllerComponent } from './context/provider';
-import { dispatchOverlay } from './context/store';
+import { type OverlayItem, dispatchOverlay } from './context/store';
 import { randomId } from './utils';
 
 type OpenOverlayOptions = {
-  overlayId?: string;
+  overlayId?: OverlayItem['id'];
 };
 
 function open(controller: OverlayControllerComponent, options?: OpenOverlayOptions) {
@@ -40,10 +40,10 @@ async function openAsync<T>(controller: OverlayAsyncControllerComponent<T>, opti
   });
 }
 
-function close(overlayId: string) {
+function close(overlayId: OverlayItem['id']) {
   dispatchOverlay({ type: 'CLOSE', overlayId });
 }
-function unmount(overlayId: string) {
+function unmount(overlayId: OverlayItem['id']) {
   dispatchOverlay({ type: 'REMOVE', overlayId });
 }
 function closeAll() {