diff --git a/components/_util/type.ts b/components/_util/type.ts
index 4059fa18c..ec6b1aeec 100644
--- a/components/_util/type.ts
+++ b/components/_util/type.ts
@@ -1,4 +1,4 @@
-import { PropType } from 'vue';
+import { PropType, VNodeChild } from 'vue';
 
 export type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
 // https://stackoverflow.com/questions/46176165/ways-to-get-string-literal-type-of-array-values-without-enum-overhead
@@ -29,3 +29,5 @@ export interface PropOptions<T = any, D = T> {
   default?: D | DefaultFactory<D> | null | undefined | object;
   validator?(value: unknown): boolean;
 }
+
+export type VueNode = VNodeChild | JSX.Element;
diff --git a/components/affix/style/index.js b/components/affix/style/index.ts
similarity index 100%
rename from components/affix/style/index.js
rename to components/affix/style/index.ts
diff --git a/components/alert/style/index.js b/components/alert/style/index.ts
similarity index 100%
rename from components/alert/style/index.js
rename to components/alert/style/index.ts
diff --git a/components/anchor/style/index.js b/components/anchor/style/index.ts
similarity index 100%
rename from components/anchor/style/index.js
rename to components/anchor/style/index.ts
diff --git a/components/auto-complete/style/index.js b/components/auto-complete/style/index.ts
similarity index 100%
rename from components/auto-complete/style/index.js
rename to components/auto-complete/style/index.ts
diff --git a/components/avatar/Avatar.jsx b/components/avatar/Avatar.tsx
similarity index 75%
rename from components/avatar/Avatar.jsx
rename to components/avatar/Avatar.tsx
index 14c4ffc5a..200c328e3 100644
--- a/components/avatar/Avatar.jsx
+++ b/components/avatar/Avatar.tsx
@@ -1,31 +1,28 @@
-import { inject } from 'vue';
+import { tuple, VueNode } from '../_util/type';
+import { CSSProperties, defineComponent, inject, PropType } from 'vue';
 import { defaultConfigProvider } from '../config-provider';
 import { getComponent } from '../_util/props-util';
 import PropTypes from '../_util/vue-types';
 
-export default {
+export default defineComponent({
   name: 'AAvatar',
   props: {
-    prefixCls: {
-      type: String,
-      default: undefined,
-    },
-    shape: {
-      validator: val => ['circle', 'square'].includes(val),
-      default: 'circle',
-    },
+    prefixCls: PropTypes.string,
+    shape: PropTypes.oneOf(tuple('circle', 'square')),
     size: {
-      validator: val => {
-        return typeof val === 'number' || ['small', 'large', 'default'].includes(val);
-      },
-      default: 'default',
+      type: [Number, String] as PropType<'large' | 'small' | 'default' | number>,
+      default: 'default'
     },
-    src: String,
+    src: PropTypes.string,
     /** Srcset of image avatar */
-    srcSet: String,
-    icon: PropTypes.any,
-    alt: String,
-    loadError: Function,
+    srcset: PropTypes.string,
+    /** @deprecated please use `srcset` instead `srcSet` */
+    srcSet: PropTypes.string,
+    icon: PropTypes.VNodeChild,
+    alt: PropTypes.string,
+    loadError:  {
+      type: Function as PropType<()=>boolean>
+    },
   },
   setup() {
     return {
@@ -37,6 +34,8 @@ export default {
       isImgExist: true,
       isMounted: false,
       scale: 1,
+      lastChildrenWidth: undefined,
+      lastNodeWidth: undefined
     };
   },
   watch: {
@@ -65,8 +64,8 @@ export default {
       if (!this.$refs.avatarChildren || !this.$refs.avatarNode) {
         return;
       }
-      const childrenWidth = this.$refs.avatarChildren.offsetWidth; // offsetWidth avoid affecting be transform scale
-      const nodeWidth = this.$refs.avatarNode.offsetWidth;
+      const childrenWidth = (this.$refs.avatarChildren as HTMLElement).offsetWidth; // offsetWidth avoid affecting be transform scale
+      const nodeWidth = (this.$refs.avatarNode as HTMLElement).offsetWidth;
       // denominator is 0 is no meaning
       if (
         childrenWidth === 0 ||
@@ -89,7 +88,7 @@ export default {
     },
   },
   render() {
-    const { prefixCls: customizePrefixCls, shape, size, src, alt, srcSet } = this.$props;
+    const { prefixCls: customizePrefixCls, shape, size, src, alt, srcset, srcSet } = this.$props;
     const icon = getComponent(this, 'icon');
     const getPrefixCls = this.configProvider.getPrefixCls;
     const prefixCls = getPrefixCls('avatar', customizePrefixCls);
@@ -109,7 +108,7 @@ export default {
       [`${prefixCls}-icon`]: icon,
     };
 
-    const sizeStyle =
+    const sizeStyle: CSSProperties =
       typeof size === 'number'
         ? {
             width: `${size}px`,
@@ -119,16 +118,16 @@ export default {
           }
         : {};
 
-    let children = this.$slots.default && this.$slots.default();
+    let children: VueNode = this.$slots.default && this.$slots.default();
     if (src && isImgExist) {
-      children = <img src={src} srcSet={srcSet} onError={this.handleImgLoadError} alt={alt} />;
+      children = <img src={src} srcset={srcset || srcSet} onError={this.handleImgLoadError} alt={alt} />;
     } else if (icon) {
       children = icon;
     } else {
       const childrenNode = this.$refs.avatarChildren;
       if (childrenNode || scale !== 1) {
         const transformString = `scale(${scale}) translateX(-50%)`;
-        const childrenStyle = {
+        const childrenStyle: CSSProperties = {
           msTransform: transformString,
           WebkitTransform: transformString,
           transform: transformString,
@@ -149,7 +148,7 @@ export default {
           </span>
         );
       } else {
-        const childrenStyle = {};
+        const childrenStyle: CSSProperties = {};
         if (!isMounted) {
           childrenStyle.opacity = 0;
         }
@@ -166,4 +165,4 @@ export default {
       </span>
     );
   },
-};
+});
diff --git a/components/avatar/index.js b/components/avatar/index.ts
similarity index 65%
rename from components/avatar/index.js
rename to components/avatar/index.ts
index 72d914710..356239782 100644
--- a/components/avatar/index.js
+++ b/components/avatar/index.ts
@@ -1,7 +1,8 @@
+import { App } from 'vue';
 import Avatar from './Avatar';
 
 /* istanbul ignore next */
-Avatar.install = function(app) {
+Avatar.install = function(app: App) {
   app.component(Avatar.name, Avatar);
 };
 
diff --git a/components/avatar/style/index.js b/components/avatar/style/index.ts
similarity index 100%
rename from components/avatar/style/index.js
rename to components/avatar/style/index.ts
diff --git a/components/back-top/backTopTypes.js b/components/back-top/backTopTypes.ts
similarity index 100%
rename from components/back-top/backTopTypes.js
rename to components/back-top/backTopTypes.ts
diff --git a/components/back-top/index.jsx b/components/back-top/index.tsx
similarity index 94%
rename from components/back-top/index.jsx
rename to components/back-top/index.tsx
index 487e9af46..7453f914f 100644
--- a/components/back-top/index.jsx
+++ b/components/back-top/index.tsx
@@ -1,4 +1,4 @@
-import { inject, Transition } from 'vue';
+import { App, defineComponent, inject, Transition } from 'vue';
 import classNames from '../_util/classNames';
 import PropTypes from '../_util/vue-types';
 import backTopTypes from './backTopTypes';
@@ -15,7 +15,7 @@ function getDefaultTarget() {
 
 const props = backTopTypes();
 
-const BackTop = {
+const BackTop = defineComponent({
   name: 'ABackTop',
   inheritAttrs: false,
   mixins: [BaseMixin],
@@ -29,9 +29,9 @@ const BackTop = {
     };
   },
   data() {
-    this.scrollEvent = null;
     return {
       visible: false,
+      scrollEvent: null,
     };
   },
   mounted() {
@@ -97,10 +97,10 @@ const BackTop = {
     const transitionProps = getTransitionProps('fade');
     return <Transition {...transitionProps}>{backTopBtn}</Transition>;
   },
-};
+});
 
 /* istanbul ignore next */
-BackTop.install = function(app) {
+BackTop.install = function(app: App) {
   app.component(BackTop.name, BackTop);
 };
 
diff --git a/components/badge/Badge.jsx b/components/badge/Badge.tsx
similarity index 90%
rename from components/badge/Badge.jsx
rename to components/badge/Badge.tsx
index cfd218b98..d81e1c653 100644
--- a/components/badge/Badge.jsx
+++ b/components/badge/Badge.tsx
@@ -7,11 +7,12 @@ import { cloneElement } from '../_util/vnode';
 import getTransitionProps from '../_util/getTransitionProps';
 import isNumeric from '../_util/isNumeric';
 import { defaultConfigProvider } from '../config-provider';
-import { inject, Transition } from 'vue';
+import { inject, Transition, defineComponent, CSSProperties } from 'vue';
+import { tuple } from '../_util/type';
 
 const BadgeProps = {
   /** Number to show in badge */
-  count: PropTypes.any,
+  count: PropTypes.VNodeChild,
   showZero: PropTypes.looseBool,
   /** Max count to show */
   overflowCount: PropTypes.number,
@@ -19,26 +20,27 @@ const BadgeProps = {
   dot: PropTypes.looseBool,
   prefixCls: PropTypes.string,
   scrollNumberPrefixCls: PropTypes.string,
-  status: PropTypes.oneOf(['success', 'processing', 'default', 'error', 'warning']),
+  status: PropTypes.oneOf(tuple('success', 'processing', 'default', 'error', 'warning')),
   color: PropTypes.string,
-  text: PropTypes.any,
-  offset: PropTypes.array,
-  numberStyle: PropTypes.object.def(() => ({})),
+  text: PropTypes.VNodeChild,
+  offset: PropTypes.arrayOf(PropTypes.oneOfType([String, Number])),
+  numberStyle: PropTypes.style,
   title: PropTypes.string,
 };
-function isPresetColor(color) {
-  return PresetColorTypes.indexOf(color) !== -1;
+function isPresetColor(color?: string): boolean {
+  return (PresetColorTypes as any[]).indexOf(color) !== -1;
 }
-export default {
+export default defineComponent({
   name: 'ABadge',
   props: initDefaultProps(BadgeProps, {
     showZero: false,
     dot: false,
     overflowCount: 99,
-  }),
+  }) as typeof BadgeProps,
   setup() {
     return {
       configProvider: inject('configProvider', defaultConfigProvider),
+      badgeCount: undefined
     };
   },
   methods: {
@@ -71,7 +73,7 @@ export default {
       const { offset, numberStyle } = this.$props;
       return offset
         ? {
-            right: `${-parseInt(offset[0], 10)}px`,
+            right: `${-parseInt(offset[0] as string, 10)}px`,
             marginTop: isNumeric(offset[1]) ? `${offset[1]}px` : offset[1],
             ...numberStyle,
           }
@@ -156,7 +158,7 @@ export default {
         <ScrollNumber
           prefixCls={scrollNumberPrefixCls}
           data-show={!hidden}
-          vShow={!hidden}
+          v-show={!hidden}
           class={scrollNumberCls}
           count={displayCount}
           displayComponent={this.renderDispayComponent()}
@@ -194,7 +196,7 @@ export default {
       [`${prefixCls}-status-${status}`]: !!status,
       [`${prefixCls}-status-${color}`]: isPresetColor(color),
     });
-    const statusStyle = {};
+    const statusStyle: CSSProperties = {};
     if (color && !isPresetColor(color)) {
       statusStyle.background = color;
     }
@@ -222,4 +224,4 @@ export default {
       </span>
     );
   },
-};
+});
diff --git a/components/badge/ScrollNumber.jsx b/components/badge/ScrollNumber.tsx
similarity index 94%
rename from components/badge/ScrollNumber.jsx
rename to components/badge/ScrollNumber.tsx
index 675ce6028..3e5d945be 100644
--- a/components/badge/ScrollNumber.jsx
+++ b/components/badge/ScrollNumber.tsx
@@ -4,7 +4,7 @@ import BaseMixin from '../_util/BaseMixin';
 import omit from 'omit.js';
 import { cloneElement } from '../_util/vnode';
 import { defaultConfigProvider } from '../config-provider';
-import { inject } from 'vue';
+import { CSSProperties, defineComponent, inject } from 'vue';
 
 function getNumberArray(num) {
   return num
@@ -28,7 +28,7 @@ const ScrollNumberProps = {
   onAnimated: PropTypes.func,
 };
 
-export default {
+export default defineComponent({
   name: 'ScrollNumber',
   mixins: [BaseMixin],
   inheritAttrs: false,
@@ -36,10 +36,11 @@ export default {
   setup() {
     return {
       configProvider: inject('configProvider', defaultConfigProvider),
+      lastCount: undefined,
+      timeout: undefined,
     };
   },
   data() {
-    this.lastCount = undefined;
     return {
       animateStarted: true,
       sCount: this.count,
@@ -159,10 +160,10 @@ export default {
   },
 
   render() {
-    const { prefixCls: customizePrefixCls, title, component: Tag = 'sup', displayComponent } = this;
+    const { prefixCls: customizePrefixCls, title, component: Tag = 'sup' as any, displayComponent } = this;
     const getPrefixCls = this.configProvider.getPrefixCls;
     const prefixCls = getPrefixCls('scroll-number', customizePrefixCls);
-    const { class: className, style = {} } = this.$attrs;
+    const { class: className, style = {} } = this.$attrs as {class?: string, style?: CSSProperties};
     if (displayComponent) {
       return cloneElement(displayComponent, {
         class: classNames(
@@ -195,4 +196,4 @@ export default {
 
     return <Tag {...newProps}>{this.renderNumberElement(prefixCls)}</Tag>;
   },
-};
+});
diff --git a/components/badge/index.js b/components/badge/index.ts
similarity index 65%
rename from components/badge/index.js
rename to components/badge/index.ts
index 536522bcd..487616115 100644
--- a/components/badge/index.js
+++ b/components/badge/index.ts
@@ -1,7 +1,8 @@
+import { App } from 'vue';
 import Badge from './Badge';
 
 /* istanbul ignore next */
-Badge.install = function(app) {
+Badge.install = function(app: App) {
   app.component(Badge.name, Badge);
 };
 
diff --git a/components/index.js b/components/index.ts
similarity index 97%
rename from components/index.js
rename to components/index.ts
index 5d9c73dc4..b719cc047 100644
--- a/components/index.js
+++ b/components/index.ts
@@ -14,6 +14,7 @@ if (
   );
 }
 /* @remove-on-es-build-end */
+import { App } from 'vue';
 
 import { default as Affix } from './affix';
 
@@ -210,9 +211,9 @@ const components = [
   Space,
 ];
 
-const install = function(app) {
-  components.map(component => {
-    app.use(component);
+const install = function(app: App) {
+  components.forEach(component => {
+    app.use(component as { install: () => any });
   });
 
   app.config.globalProperties.$message = message;
diff --git a/components/style.js b/components/style.ts
similarity index 100%
rename from components/style.js
rename to components/style.ts
diff --git a/examples/index.js b/examples/index.js
index ed2e2c975..2eac35440 100644
--- a/examples/index.js
+++ b/examples/index.js
@@ -1,8 +1,8 @@
 import '@babel/polyfill';
-import 'ant-design-vue/style.js';
+import 'ant-design-vue/style';
 import { createApp, version } from 'vue';
 import App from './App.vue';
-import antd from 'ant-design-vue/index.js';
+import antd from 'ant-design-vue/index.ts';
 
 // eslint-disable-next-line no-console
 console.log('Vue version: ', version);