diff --git a/src/area/README.md b/src/area/README.md
index b8432f855..926097abe 100644
--- a/src/area/README.md
+++ b/src/area/README.md
@@ -92,9 +92,9 @@ To have a selected value，simply pass the `code` of target area to `value` prop
 
 Use [ref](https://v3.vuejs.org/guide/component-template-refs.html) to get Area instance and call instance methods.
 
-| Name  | Description               | Attribute     | Return value |
-| ----- | ------------------------- | ------------- | ------------ |
-| reset | Reset all options by code | code?: string | -            |
+| Name  | Description               | Attribute       | Return value |
+| ----- | ------------------------- | --------------- | ------------ |
+| reset | Reset all options by code | _code?: string_ | -            |
 
 ### areaList Data Structure
 
diff --git a/src/area/README.zh-CN.md b/src/area/README.zh-CN.md
index 71630e354..98ce5d20b 100644
--- a/src/area/README.zh-CN.md
+++ b/src/area/README.zh-CN.md
@@ -94,7 +94,7 @@ app.use(Area);
 
 | 方法名 | 说明 | 参数 | 返回值 |
 | --- | --- | --- | --- |
-| reset | 根据 code 重置所有选项，若不传 code，则重置到第一项 | code?: string | - |
+| reset | 根据 code 重置所有选项，若不传 code，则重置到第一项 | _code?: string_ | - |
 
 ### 省市区列表数据格式
 
diff --git a/src/area/index.js b/src/area/index.tsx
similarity index 75%
rename from src/area/index.js
rename to src/area/index.tsx
index 1777435ab..3a5761075 100644
--- a/src/area/index.js
+++ b/src/area/index.tsx
@@ -1,27 +1,48 @@
-import { ref, watch, computed, reactive, nextTick, onMounted } from 'vue';
+/* eslint-disable camelcase */
+import {
+  ref,
+  watch,
+  computed,
+  reactive,
+  nextTick,
+  PropType,
+  onMounted,
+  ComponentPublicInstance,
+} from 'vue';
+
+// Utils
+import { deepClone } from '../utils/deep-clone';
 import { createNamespace, pick } from '../utils';
+
+// Composition
 import { useExpose } from '../composables/use-expose';
+
+// Components
+import Picker, { PickerObjectOption } from '../picker';
 import { pickerProps } from '../picker/shared';
-import Picker from '../picker';
 
 const [createComponent, bem] = createNamespace('area');
 
 const EMPTY_CODE = '000000';
 
-function isOverseaCode(code) {
+function isOverseaCode(code: string) {
   return code[0] === '9';
 }
 
-function clone(obj) {
-  return JSON.parse(JSON.stringify(obj));
-}
+export type AreaList = {
+  city_list: Record<string, string>;
+  county_list: Record<string, string>;
+  province_list: Record<string, string>;
+};
+
+type ColumnType = 'province' | 'county' | 'city';
 
 export default createComponent({
   props: {
     ...pickerProps,
     value: String,
     areaList: {
-      type: Object,
+      type: Object as PropType<AreaList>,
       default: () => ({}),
     },
     columnsNum: {
@@ -29,11 +50,11 @@ export default createComponent({
       default: 3,
     },
     isOverseaCode: {
-      type: Function,
+      type: Function as PropType<(code: string) => boolean>,
       default: isOverseaCode,
     },
     columnsPlaceholder: {
-      type: Array,
+      type: Array as PropType<string[]>,
       default: () => [],
     },
   },
@@ -41,7 +62,8 @@ export default createComponent({
   emits: ['change', 'confirm'],
 
   setup(props, { emit, slots }) {
-    const pickerRef = ref();
+    // eslint-disable-next-line
+    const pickerRef = ref<ComponentPublicInstance<{}, any>>();
 
     const state = reactive({
       code: props.value,
@@ -86,15 +108,14 @@ export default createComponent({
       return '';
     };
 
-    // get list by code
-    const getList = (type, code) => {
-      let result = [];
+    const getColumnValues = (type: ColumnType, code?: string) => {
+      let column: PickerObjectOption[] = [];
       if (type !== 'province' && !code) {
-        return result;
+        return column;
       }
 
       const list = areaList.value[type];
-      result = Object.keys(list).map((listCode) => ({
+      column = Object.keys(list).map((listCode) => ({
         code: listCode,
         name: list[listCode],
       }));
@@ -104,10 +125,10 @@ export default createComponent({
         if (type === 'city' && props.isOverseaCode(code)) {
           code = '9';
         }
-        result = result.filter((item) => item.code.indexOf(code) === 0);
+        column = column.filter((item) => item.code.indexOf(code!) === 0);
       }
 
-      if (placeholderMap.value[type] && result.length) {
+      if (placeholderMap.value[type] && column.length) {
         // set columns placeholder
         let codeFill = '';
         if (type === 'city') {
@@ -116,17 +137,17 @@ export default createComponent({
           codeFill = EMPTY_CODE.slice(4, 6);
         }
 
-        result.unshift({
+        column.unshift({
           code: code + codeFill,
           name: placeholderMap.value[type],
         });
       }
 
-      return result;
+      return column;
     };
 
     // get index by code
-    const getIndex = (type, code) => {
+    const getIndex = (type: ColumnType, code: string) => {
       let compareNum = code.length;
       if (type === 'province') {
         compareNum = props.isOverseaCode(code) ? 1 : 2;
@@ -137,7 +158,7 @@ export default createComponent({
 
       code = code.slice(0, compareNum);
 
-      const list = getList(
+      const list = getColumnValues(
         type,
         compareNum > 2 ? code.slice(0, compareNum - 2) : ''
       );
@@ -152,14 +173,10 @@ export default createComponent({
     };
 
     const setValues = () => {
-      let { code } = state;
-      if (!code) {
-        code = getDefaultCode();
-      }
-
+      let code = state.code || getDefaultCode();
       const picker = pickerRef.value;
-      const province = getList('province');
-      const city = getList('city', code.slice(0, 2));
+      const province = getColumnValues('province');
+      const city = getColumnValues('city', code.slice(0, 2));
 
       if (!picker) {
         return;
@@ -176,7 +193,7 @@ export default createComponent({
         [{ code }] = city;
       }
 
-      picker.setColumnValues(2, getList('county', code.slice(0, 4)));
+      picker.setColumnValues(2, getColumnValues('county', code.slice(0, 4)));
       picker.setIndexes([
         getIndex('province', code),
         getIndex('city', code),
@@ -185,10 +202,10 @@ export default createComponent({
     };
 
     // parse output columns data
-    const parseValues = (values) => {
+    const parseValues = (values: PickerObjectOption[]) => {
       return values.map((value, index) => {
         if (value) {
-          value = clone(value);
+          value = deepClone(value);
 
           if (!value.code || value.name === props.columnsPlaceholder[index]) {
             value.code = '';
@@ -202,7 +219,9 @@ export default createComponent({
 
     const getValues = () => {
       if (pickerRef.value) {
-        const values = pickerRef.value.getValues().filter((value) => !!value);
+        const values = pickerRef.value
+          .getValues()
+          .filter((value: PickerObjectOption) => !!value);
         return parseValues(values);
       }
       return [];
@@ -246,15 +265,15 @@ export default createComponent({
       setValues();
     };
 
-    const onChange = (values, index) => {
+    const onChange = (values: PickerObjectOption[], index: number) => {
       state.code = values[index].code;
       setValues();
 
-      const parsedValues = parseValues(pickerRef.value.getValues());
+      const parsedValues = parseValues(pickerRef.value!.getValues());
       emit('change', parsedValues, index);
     };
 
-    const onConfirm = (values, index) => {
+    const onConfirm = (values: PickerObjectOption[], index: number) => {
       setValues();
       emit('confirm', parseValues(values), index);
     };
diff --git a/src/picker/PickerColumn.tsx b/src/picker/PickerColumn.tsx
index 3068f45e2..3612d8a6d 100644
--- a/src/picker/PickerColumn.tsx
+++ b/src/picker/PickerColumn.tsx
@@ -29,14 +29,14 @@ function getElementTranslateY(element: Element) {
   return Number(translateY);
 }
 
-export type PickerOption =
-  | string
-  | {
-      text: string;
-      disabled?: boolean;
-      // for custom filed names
-      [key: string]: any;
-    };
+export type PickerObjectOption = {
+  text?: string;
+  disabled?: boolean;
+  // for custom filed names
+  [key: string]: any;
+};
+
+export type PickerOption = string | PickerObjectOption;
 
 export type PickerObjectColumn = {
   values?: PickerOption[];
diff --git a/src/picker/index.tsx b/src/picker/index.tsx
index ded83c6cf..109ca64f0 100644
--- a/src/picker/index.tsx
+++ b/src/picker/index.tsx
@@ -12,9 +12,10 @@ import { useExpose } from '../composables/use-expose';
 // Components
 import Loading from '../loading';
 import Column, {
-  PickerOption,
   PickerColumn,
+  PickerOption,
   PickerObjectColumn,
+  PickerObjectOption,
 } from './PickerColumn';
 
 const [createComponent, bem, t] = createNamespace('picker');
@@ -27,6 +28,13 @@ export type PickerFieldNames = {
   children?: string;
 };
 
+export type {
+  PickerColumn,
+  PickerOption,
+  PickerObjectColumn,
+  PickerObjectOption,
+};
+
 export default createComponent({
   props: {
     ...pickerProps,
diff --git a/src/vue-tsx-shim.d.ts b/src/vue-tsx-shim.d.ts
index a9268530a..bd0e93017 100644
--- a/src/vue-tsx-shim.d.ts
+++ b/src/vue-tsx-shim.d.ts
@@ -2,18 +2,22 @@ import 'vue';
 
 type EventHandler = (...args: any[]) => void;
 
-// TODO
-// should be removed after Vue supported component events typing
-// see: https://github.com/vuejs/vue-next/issues/1553
-//      https://github.com/vuejs/vue-next/issues/3029
 declare module 'vue' {
   interface ComponentCustomProps {
     role?: string;
     tabindex?: number;
+    // should be removed after Vue supported component events typing
+    // see: https://github.com/vuejs/vue-next/issues/1553
+    //      https://github.com/vuejs/vue-next/issues/3029
+    onBlur?: EventHandler;
+    onFocus?: EventHandler;
+    onInput?: EventHandler;
     onClick?: EventHandler;
+    onCancel?: EventHandler;
     onClosed?: EventHandler;
     onChange?: EventHandler;
     onToggle?: EventHandler;
+    onConfirm?: EventHandler;
     onClickStep?: EventHandler;
   }
 }