diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1db8443..a9fdaef 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,7 +7,7 @@ jobs:
   build:
     docker:
       # specify the version you desire here
-      - image: circleci/node:10.23.3
+      - image: node:18.12
       
       # Specify service dependencies here if necessary
       # CircleCI maintains a library of pre-built images
@@ -26,11 +26,11 @@ jobs:
           # fallback to using the latest cache if no exact match is found
           - v1-dependencies-
 
-      - run:
-          name: Workaround for GoogleChrome/puppeteer#290
-          command: 'sh .circleci/setup_puppeteer.sh'
+      # - run:
+      #     name: Workaround for GoogleChrome/puppeteer#290
+      #     command: 'sh .circleci/setup_puppeteer.sh'
 
-      - run: yarn install
+      - run: npm install
 
       - save_cache:
           paths:
@@ -38,5 +38,5 @@ jobs:
           key: v1-dependencies-{{ checksum "package.json" }}
         
       # run tests!
-      - run: yarn lint
-      - run: yarn test
+      - run: npm run lint
+      - run: npm run test
diff --git a/.eslintrc b/.eslintrc
index 1c0a62a..068d356 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,9 +1,20 @@
 {
-  "extends": "standard",
+  "extends": [
+    "standard",
+    "plugin:@typescript-eslint/recommended"
+  ],
   "env": {
     "browser": true,
     "es6": true,
     "jest": true,
     "mocha": true
+  },
+  "parser": "@typescript-eslint/parser",
+  "rules": {
+    "@typescript-eslint/no-this-alias": 0,
+    "@typescript-eslint/ban-types": 0,
+    "prefer-rest-params": 0,
+    "@typescript-eslint/ban-ts-comment": 0,
+    "@typescript-eslint/no-empty-function": 0
   }
 }
\ No newline at end of file
diff --git a/package.json b/package.json
index abdc67e..9ad0201 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "unpkg": "vue-lazyload.js",
   "scripts": {
     "build": "node build",
-    "lint": "eslint ./src",
+    "lint": "eslint ./src/**/*.ts",
     "test": "jest"
   },
   "dependencies": {},
@@ -35,12 +35,26 @@
   "jest": {
     "setupFiles": [
       "jest-canvas-mock"
-    ]
+    ],
+    "transform": {
+      "\\.[jt]sx?$": "ts-jest"
+    },
+    "testEnvironment": "jsdom",
+    "testEnvironmentOptions": {
+      "customExportConditions": [
+        "node",
+        "node-addons"
+      ]
+    }
   },
   "devDependencies": {
     "@babel/plugin-syntax-dynamic-import": "^7.8.3",
     "@babel/preset-env": "^7.13.12",
     "@rollup/plugin-replace": "^2.4.2",
+    "@typescript-eslint/eslint-plugin": "^5.44.0",
+    "@typescript-eslint/parser": "^5.44.0",
+    "@vue/test-utils": "^2.2.4",
+    "assert": "^2.0.0",
     "assign-deep": "^1.0.1",
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.3",
@@ -56,8 +70,9 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^4.3.1",
     "eslint-plugin-standard": "^5.0.0",
-    "jest": "^26.6.3",
+    "jest": "^29",
     "jest-canvas-mock": "^2.3.1",
+    "jest-environment-jsdom": "^29.3.1",
     "mocha": "^8.3.2",
     "rollup": "^2.43.1",
     "rollup-plugin-babel": "^2.6.1",
@@ -66,6 +81,7 @@
     "rollup-plugin-replace": "^2.2.0",
     "rollup-plugin-terser": "^7.0.2",
     "rollup-plugin-typescript": "^1.0.1",
+    "ts-jest": "^29.0.3",
     "tslib": "^2.1.0",
     "typescript": "^4.1.3",
     "vue": "^3.0.9"
diff --git a/src/lazy-component.ts b/src/lazy-component.ts
index 7c94223..2362ae5 100644
--- a/src/lazy-component.ts
+++ b/src/lazy-component.ts
@@ -19,7 +19,7 @@ export default (lazy: Lazy) => {
       }
     },
     emits: ['show'],
-    setup(props, { emit, slots }) {
+    setup (props, { emit, slots }) {
       const el = ref<HTMLElement>()
       const state = reactive({
         loaded: false,
@@ -39,7 +39,7 @@ export default (lazy: Lazy) => {
           rect,
           checkInView,
           load,
-          state,
+          state
         }
       })
 
@@ -47,7 +47,7 @@ export default (lazy: Lazy) => {
         lazy.addLazyBox(vm.value)
         lazy.lazyLoadHandler()
       })
-      
+
       onUnmounted(() => {
         lazy.removeComponent(vm.value)
       })
@@ -61,4 +61,4 @@ export default (lazy: Lazy) => {
       )
     }
   })
-}
\ No newline at end of file
+}
diff --git a/src/lazy-container.ts b/src/lazy-container.ts
index 2115dd0..1d27c1e 100644
--- a/src/lazy-container.ts
+++ b/src/lazy-container.ts
@@ -7,6 +7,7 @@ import Lazy from './lazy'
 
 export default class LazyContainerMananger {
   lazy: Lazy;
+  // eslint-disable-next-line no-use-before-define
   _queue: Array<LazyContainer>;
   constructor (lazy: Lazy) {
     this.lazy = lazy
diff --git a/src/lazy-image.ts b/src/lazy-image.ts
index 3373ae8..c51612a 100644
--- a/src/lazy-image.ts
+++ b/src/lazy-image.ts
@@ -22,13 +22,13 @@ export default (lazy: Lazy) => {
     src: TvalueFormatterParam,
     tag: string
   }>({
-    setup(props,{ slots }) {
+    setup (props, { slots }) {
       const el = ref<HTMLElement>()
       const options = reactive({
-          src: '',
-          error: '',
-          loading: '',
-          attempt: lazy.options.attempt
+        src: '',
+        error: '',
+        loading: '',
+        attempt: lazy.options.attempt
       })
       const state = reactive({
         loaded: false,
@@ -58,7 +58,7 @@ export default (lazy: Lazy) => {
           rect,
           checkInView,
           load,
-          state,
+          state
         }
       })
 
@@ -80,7 +80,7 @@ export default (lazy: Lazy) => {
       }
 
       watch(
-        ()=> props.src,
+        () => props.src,
         () => {
           init()
           lazy.addLazyBox(vm.value)
diff --git a/src/lazy.ts b/src/lazy.ts
index 8cb2685..d41b56d 100644
--- a/src/lazy.ts
+++ b/src/lazy.ts
@@ -7,8 +7,6 @@ import {
   getDPR,
   scrollParent,
   getBestSelectionFromSrcset,
-  assign,
-  isObject,
   hasIntersectionObserver,
   modeType,
   ImageCache
@@ -49,7 +47,6 @@ type Tlistener = {
 
 export type TvalueFormatterParam = string | Pick<VueLazyloadOptions, 'loading' | 'error'> & { src: string }
 
-
 class Lazy {
   version: string;
   mode: string;
@@ -68,6 +65,7 @@ class Lazy {
       error: Array<any>
     }
   };
+
   $on!: (event: TeventType, func: Function) => void;
   $once!: (event: TeventType, func: Function) => void
   $off!: (event: TeventType, func: Function) => void
@@ -89,7 +87,7 @@ class Lazy {
     observerOptions
   }:VueLazyloadOptions) {
     this.version = '__VUE_LAZYLOAD_VERSION__'
-    this.lazyContainerMananger = null;
+    this.lazyContainerMananger = null
     this.mode = modeType.event
     this.ListenerQueue = []
     this.TargetIndex = 0
@@ -256,7 +254,7 @@ class Lazy {
    * @param  {Vue} vm Vue instance
    * @return
    */
-    removeComponent (vm: Tlistener) {
+  removeComponent (vm: Tlistener) {
     if (!vm) return
     remove(this.ListenerQueue, vm)
     this._observer && this._observer.unobserve(vm.el)
@@ -484,8 +482,7 @@ class Lazy {
 
   _valueFormatter (
     value: TvalueFormatterParam
-  )
-  {
+  ) {
     if (typeof value === 'object') {
       if (!value.src && !this.options.silent) console.error('Vue Lazyload warning: miss src with ' + value)
       return {
@@ -504,4 +501,4 @@ class Lazy {
   }
 }
 
-export default Lazy
\ No newline at end of file
+export default Lazy
diff --git a/src/listener.ts b/src/listener.ts
index 781f267..ec6cd7b 100644
--- a/src/listener.ts
+++ b/src/listener.ts
@@ -30,12 +30,14 @@ export default class ReactiveListener {
     loadStart: number;
     loadEnd: number;
   };
+
   state!: {
     loading: boolean;
     error: boolean;
     loaded: boolean;
     rendered: boolean;
   };
+
   rect: DOMRect;
   _imageCache: ImageCache;
   constructor (
@@ -115,7 +117,7 @@ export default class ReactiveListener {
    */
   update (option: { src: string, loading: string, error: string }) {
     const oldSrc = this.src
-    this.src = option.src 
+    this.src = option.src
     this.loading = option.loading
     this.error = option.error
     this.filter()
diff --git a/src/useCheckInView.ts b/src/useCheckInView.ts
index dd057b4..dde0493 100644
--- a/src/useCheckInView.ts
+++ b/src/useCheckInView.ts
@@ -22,4 +22,4 @@ export const useCheckInView = (
     rect,
     checkInView
   }
-}
\ No newline at end of file
+}
diff --git a/src/util.ts b/src/util.ts
index ab9762e..a05510f 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -5,7 +5,7 @@ const inBrowser = typeof window !== 'undefined' && window !== null
 
 export const hasIntersectionObserver = checkIntersectionObserver()
 
-function checkIntersectionObserver(): boolean {
+function checkIntersectionObserver (): boolean {
   if (inBrowser &&
     'IntersectionObserver' in window &&
     'IntersectionObserverEntry' in window &&
@@ -15,10 +15,10 @@ function checkIntersectionObserver(): boolean {
     if (!('isIntersecting' in window.IntersectionObserverEntry.prototype)) {
       Object.defineProperty(window.IntersectionObserverEntry.prototype,
         'isIntersecting', {
-        get: function () {
-          return this.intersectionRatio > 0
-        }
-      })
+          get: function () {
+            return this.intersectionRatio > 0
+          }
+        })
     }
     return true
   }
@@ -30,16 +30,16 @@ export const modeType = {
   observer: 'observer'
 }
 
-function remove(arr: Array<any>, item: any) {
+function remove (arr: Array<any>, item: any) {
   if (!arr.length) return
   const index = arr.indexOf(item)
   if (index > -1) return arr.splice(index, 1)
 }
 
-function getBestSelectionFromSrcset(el: Element, scale: number): string {
+function getBestSelectionFromSrcset (el: Element, scale: number): string {
   if (el.tagName !== 'IMG' || !el.getAttribute('data-srcset')) return ''
 
-  let options = el.getAttribute('data-srcset')!.trim().split(',')
+  const options = el.getAttribute('data-srcset')!.trim().split(',')
   const result: Array<[tmpWidth: number, tmpSrc: string]> = []
   const container = el.parentNode as HTMLElement
   const containerWidth = container.offsetWidth * scale
@@ -100,10 +100,10 @@ function getBestSelectionFromSrcset(el: Element, scale: number): string {
 const getDPR = (scale = 1): number => inBrowser ? (window.devicePixelRatio || scale) : scale
 
 // https://developers.google.com/speed/webp/faq#how_can_i_detect_browser_support_using_javascript
-function supportWebp() {
+function supportWebp () {
   if (!inBrowser) return false
 
-  let support: boolean = true
+  let support = true
 
   type TkTestImages = {
     lossy: string;
@@ -111,7 +111,7 @@ function supportWebp() {
     alpha: string;
     animation: string;
   }
-  function checkWebpFeature(feature: keyof TkTestImages , callback: Function) {
+  function checkWebpFeature (feature: keyof TkTestImages, callback: Function) {
     const kTestImages: TkTestImages = {
       lossy: 'UklGRiIAAABXRUJQVlA4IBYAAAAwAQCdASoBAAEADsD+JaQAA3AAAAAA',
       lossless: 'UklGRhoAAABXRUJQVlA4TA0AAAAvAAAAEAcQERGIiP4HAA==',
@@ -138,7 +138,7 @@ function supportWebp() {
   return support
 }
 
-function throttle(action: Function, delay: number) {
+function throttle (action: Function, delay: number) {
   let timeout: any = null
   let lastRun = 0
   return function () {
@@ -162,7 +162,7 @@ function throttle(action: Function, delay: number) {
   }
 }
 
-function testSupportsPassive(): boolean {
+function testSupportsPassive (): boolean {
   if (!inBrowser) return false
   let support = false
   try {
@@ -179,7 +179,7 @@ function testSupportsPassive(): boolean {
 const supportsPassive = testSupportsPassive()
 
 const _ = {
-  on(el: Element, type: string, func: ()=>void, capture = false) {
+  on (el: Element, type: string, func: ()=>void, capture = false) {
     if (supportsPassive) {
       el.addEventListener(type, func, {
         capture: capture,
@@ -189,7 +189,7 @@ const _ = {
       el.addEventListener(type, func, capture)
     }
   },
-  off(el: Element, type: string, func: ()=>void, capture = false) {
+  off (el: Element, type: string, func: ()=>void, capture = false) {
     el.removeEventListener(type, func, capture)
   }
 }
@@ -263,11 +263,11 @@ const scrollParent = (el:HTMLElement) => {
   return window
 }
 
-function isObject(obj: any): boolean {
+function isObject (obj: any): boolean {
   return obj !== null && typeof obj === 'object'
 }
 
-function noop(): void { }
+function noop (): void { }
 
 class ImageCache {
   max: number;
diff --git a/test/test.spec.js b/test/test.spec.js
index e632304..ab89495 100644
--- a/test/test.spec.js
+++ b/test/test.spec.js
@@ -1,7 +1,6 @@
 import { mount } from '@vue/test-utils'
 import VueLazyload from '../src'
-import genLazyCore from '../src/lazy'
-import assert from 'assert'
+import Lazy from '../src/lazy'
 import { createApp, inject } from 'vue'
 
 describe('VueLazyload.js Test Suite', function () {
@@ -21,16 +20,13 @@ describe('VueLazyload.js Test Suite', function () {
       }
     })
 
-    assert(wrapper.vm.Lazyload.mode, 'event')
+    expect(wrapper.vm.Lazyload.mode).toBe('event')
   })
 
   it('_valueFormatter', function () {
-    const app = createApp(App)
-    const LazyCore = genLazyCore(app)
-
-    const lazyload = new LazyCore({
-      error: 'error',
-      loading: 'loading'
+    const lazyload = new Lazy({
+      error: "error",
+      loading: "loading"
     })
 
     expect(lazyload._valueFormatter('src').src).toBe('src')
diff --git a/tsconfig.json b/tsconfig.json
index fc13484..a0a970d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,7 +2,8 @@
   "strict": true,
   "compilerOptions": {
     "target": "es6",
-    "module": "es2015",
+    "module": "ES2015",
+    "allowJs": true,
     "moduleResolution": "node",
     "lib": [
       "es5",