diff --git a/src/index.ts b/src/index.ts
index 2aa2e0ad..7883678d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,7 @@
 import record from './record';
 import { Replayer } from './replay';
 import { mirror } from './utils';
+import * as utils from './utils';
 
 export {
   EventType,
@@ -11,4 +12,4 @@ export {
 
 const { addCustomEvent } = record;
 
-export { record, addCustomEvent, Replayer, mirror };
+export { record, addCustomEvent, Replayer, mirror, utils };
diff --git a/src/record/observer.ts b/src/record/observer.ts
index 9d65ebdf..55fe3b1c 100644
--- a/src/record/observer.ts
+++ b/src/record/observer.ts
@@ -181,8 +181,8 @@ function initViewportResizeObserver(
   return on('resize', updateDimension, window);
 }
 
-const INPUT_TAGS = ['INPUT', 'TEXTAREA', 'SELECT'];
-const MASK_TYPES = [
+export const INPUT_TAGS = ['INPUT', 'TEXTAREA', 'SELECT'];
+export const MASK_TYPES = [
   'color',
   'date',
   'datetime-local',
diff --git a/src/replay/index.ts b/src/replay/index.ts
index 84cba123..c62a6d4a 100644
--- a/src/replay/index.ts
+++ b/src/replay/index.ts
@@ -1,4 +1,4 @@
-import { rebuild, buildNodeWithSN, idNodeMap } from 'rrweb-snapshot';
+import { rebuild, buildNodeWithSN } from 'rrweb-snapshot';
 import * as mittProxy from 'mitt';
 import * as smoothscroll from 'smoothscroll-polyfill';
 import { Timer } from './timer';
diff --git a/src/utils.ts b/src/utils.ts
index 2ee32c2f..b83a74e0 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -34,7 +34,7 @@ export const mirror: Mirror = {
     const id = n.__sn && n.__sn.id;
     delete mirror.map[id];
     if (n.childNodes) {
-      n.childNodes.forEach(child =>
+      n.childNodes.forEach((child) =>
         mirror.removeNodeFromMap((child as Node) as INode),
       );
     }
@@ -53,7 +53,7 @@ export function throttle<T>(
   let timeout: number | null = null;
   let previous = 0;
   // tslint:disable-next-line: only-arrow-functions
-  return function(arg: T) {
+  return function (arg: T) {
     let now = Date.now();
     if (!previous && options.leading === false) {
       previous = now;
@@ -83,9 +83,10 @@ export function hookSetter<T>(
   key: string | number | symbol,
   d: PropertyDescriptor,
   isRevoked?: boolean,
+  win = window,
 ): hookResetter {
-  const original = Object.getOwnPropertyDescriptor(target, key);
-  Object.defineProperty(
+  const original = win.Object.getOwnPropertyDescriptor(target, key);
+  win.Object.defineProperty(
     target,
     key,
     isRevoked
@@ -130,7 +131,7 @@ export function isBlocked(node: Node | null, blockClass: blockClass): boolean {
     if (typeof blockClass === 'string') {
       needBlock = (node as HTMLElement).classList.contains(blockClass);
     } else {
-      (node as HTMLElement).classList.forEach(className => {
+      (node as HTMLElement).classList.forEach((className) => {
         if (blockClass.test(className)) {
           needBlock = true;
         }
diff --git a/typings/index.d.ts b/typings/index.d.ts
index 2a3d0900..09491491 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -1,6 +1,7 @@
 import record from './record';
 import { Replayer } from './replay';
 import { mirror } from './utils';
+import * as utils from './utils';
 export { EventType, IncrementalSource, MouseInteractions, ReplayerEvents, } from './types';
 declare const addCustomEvent: <T>(tag: string, payload: T) => void;
-export { record, addCustomEvent, Replayer, mirror };
+export { record, addCustomEvent, Replayer, mirror, utils };
diff --git a/typings/record/observer.d.ts b/typings/record/observer.d.ts
index 4c67f319..703605fb 100644
--- a/typings/record/observer.d.ts
+++ b/typings/record/observer.d.ts
@@ -1,2 +1,4 @@
 import { observerParam, listenerHandler, hooksParam } from '../types';
+export declare const INPUT_TAGS: string[];
+export declare const MASK_TYPES: string[];
 export default function initObservers(o: observerParam, hooks?: hooksParam): listenerHandler;
diff --git a/typings/utils.d.ts b/typings/utils.d.ts
index 7b3323b7..32c62f84 100644
--- a/typings/utils.d.ts
+++ b/typings/utils.d.ts
@@ -3,7 +3,7 @@ import { INode } from 'rrweb-snapshot';
 export declare function on(type: string, fn: EventListenerOrEventListenerObject, target?: Document | Window): listenerHandler;
 export declare const mirror: Mirror;
 export declare function throttle<T>(func: (arg: T) => void, wait: number, options?: throttleOptions): (arg: T) => void;
-export declare function hookSetter<T>(target: T, key: string | number | symbol, d: PropertyDescriptor, isRevoked?: boolean): hookResetter;
+export declare function hookSetter<T>(target: T, key: string | number | symbol, d: PropertyDescriptor, isRevoked?: boolean, win?: Window & typeof globalThis): hookResetter;
 export declare function getWindowHeight(): number;
 export declare function getWindowWidth(): number;
 export declare function isBlocked(node: Node | null, blockClass: blockClass): boolean;