diff --git a/src/dropdown-item/index.js b/src/dropdown-item/index.tsx
similarity index 78%
rename from src/dropdown-item/index.js
rename to src/dropdown-item/index.tsx
index 0258e083b..33659233d 100644
--- a/src/dropdown-item/index.js
+++ b/src/dropdown-item/index.tsx
@@ -1,8 +1,14 @@
-import { reactive, Teleport } from 'vue';
+import {
+  reactive,
+  Teleport,
+  PropType,
+  TeleportProps,
+  CSSProperties,
+} from 'vue';
 
 // Utils
 import { createNamespace, UnknownProp } from '../utils';
-import { DROPDOWN_KEY } from '../dropdown-menu';
+import { DROPDOWN_KEY, DropdownMenuProvide } from '../dropdown-menu';
 
 // Composition
 import { useParent } from '@vant/use';
@@ -15,15 +21,21 @@ import Popup from '../popup';
 
 const [createComponent, bem] = createNamespace('dropdown-item');
 
+export type DropdownItemOption = {
+  text: string;
+  icon?: string;
+  value: number | string;
+};
+
 export default createComponent({
   props: {
     title: String,
     disabled: Boolean,
-    teleport: [String, Object],
+    teleport: [String, Object] as PropType<TeleportProps['to']>,
     modelValue: UnknownProp,
     titleClass: UnknownProp,
     options: {
-      type: Array,
+      type: Array as PropType<DropdownItemOption[]>,
       default: () => [],
     },
     lazyRender: {
@@ -41,9 +53,19 @@ export default createComponent({
       showWrapper: false,
     });
 
-    const { parent } = useParent(DROPDOWN_KEY);
+    const { parent } = useParent<DropdownMenuProvide>(DROPDOWN_KEY);
 
-    const createEmitter = (eventName) => () => emit(eventName);
+    if (!parent) {
+      if (process.env.NODE_ENV !== 'production') {
+        console.error(
+          '[Vant] DropdownItem must be a child component of DropdownMenu.'
+        );
+      }
+      return;
+    }
+
+    const createEmitter = (eventName: 'open' | 'close' | 'opened') => () =>
+      emit(eventName);
     const onOpen = createEmitter('open');
     const onClose = createEmitter('close');
     const onOpened = createEmitter('opened');
@@ -53,14 +75,17 @@ export default createComponent({
       emit('closed');
     };
 
-    const onClickWrapper = (event) => {
+    const onClickWrapper = (event: MouseEvent) => {
       // prevent being identified as clicking outside and closed when using teleport
       if (props.teleport) {
         event.stopPropagation();
       }
     };
 
-    const toggle = (show = !state.showPopup, options = {}) => {
+    const toggle = (
+      show = !state.showPopup,
+      options: { immediate?: boolean } = {}
+    ) => {
       if (show === state.showPopup) {
         return;
       }
@@ -89,7 +114,7 @@ export default createComponent({
       return match.length ? match[0].text : '';
     };
 
-    const renderOption = (option) => {
+    const renderOption = (option: DropdownItemOption) => {
       const { activeColor } = parent.props;
       const active = option.value === props.modelValue;
 
@@ -129,7 +154,10 @@ export default createComponent({
         closeOnClickOverlay,
       } = parent.props;
 
-      const style = { zIndex };
+      const style: CSSProperties = {
+        zIndex: zIndex !== undefined ? +zIndex : undefined,
+      };
+
       if (direction === 'down') {
         style.top = `${offset.value}px`;
       } else {
diff --git a/src/dropdown-menu/index.js b/src/dropdown-menu/index.tsx
similarity index 77%
rename from src/dropdown-menu/index.js
rename to src/dropdown-menu/index.tsx
index 47439ba5c..74531bb8e 100644
--- a/src/dropdown-menu/index.js
+++ b/src/dropdown-menu/index.tsx
@@ -1,7 +1,7 @@
-import { ref, computed } from 'vue';
+import { ref, computed, PropType, CSSProperties, Ref } from 'vue';
 
 // Utils
-import { createNamespace, isDef } from '../utils';
+import { isDef, ComponentInstance, createNamespace } from '../utils';
 
 // Composition
 import {
@@ -16,6 +16,20 @@ const [createComponent, bem] = createNamespace('dropdown-menu');
 
 export const DROPDOWN_KEY = 'vanDropdownMenu';
 
+export type DropdownMenuDirection = 'up' | 'down';
+
+export type DropdownMenuProvide = {
+  props: {
+    zIndex?: number | string;
+    overlay: boolean;
+    duration: number | string;
+    direction: DropdownMenuDirection;
+    activeColor?: string;
+    closeOnClickOverlay: boolean;
+  };
+  offset: Ref<number>;
+};
+
 export default createComponent({
   props: {
     zIndex: [Number, String],
@@ -29,7 +43,7 @@ export default createComponent({
       default: 0.2,
     },
     direction: {
-      type: String,
+      type: String as PropType<DropdownMenuDirection>,
       default: 'down',
     },
     closeOnClickOutside: {
@@ -43,11 +57,13 @@ export default createComponent({
   },
 
   setup(props, { slots }) {
-    const root = ref();
+    const root = ref<HTMLElement>();
+    const barRef = ref<HTMLElement>();
     const offset = ref(0);
-    const barRef = ref();
 
-    const { children, linkChildren } = useChildren(DROPDOWN_KEY);
+    const { children, linkChildren } = useChildren<ComponentInstance>(
+      DROPDOWN_KEY
+    );
     const scrollParent = useScrollParent(root);
 
     const opened = computed(() =>
@@ -57,8 +73,8 @@ export default createComponent({
     const barStyle = computed(() => {
       if (opened.value && isDef(props.zIndex)) {
         return {
-          zIndex: 1 + props.zIndex,
-        };
+          zIndex: +props.zIndex + 1,
+        } as CSSProperties;
       }
     });
 
@@ -87,7 +103,7 @@ export default createComponent({
       }
     };
 
-    const toggleItem = (active) => {
+    const toggleItem = (active: number) => {
       children.forEach((item, index) => {
         if (index === active) {
           updateOffset();
@@ -98,7 +114,7 @@ export default createComponent({
       });
     };
 
-    const renderTitle = (item, index) => {
+    const renderTitle = (item: ComponentInstance, index: number) => {
       const { showPopup } = item.state;
       const { disabled, titleClass } = item;
 
diff --git a/src/vue-tsx-shim.d.ts b/src/vue-tsx-shim.d.ts
index e6f4db5fc..38f08abe6 100644
--- a/src/vue-tsx-shim.d.ts
+++ b/src/vue-tsx-shim.d.ts
@@ -10,12 +10,15 @@ declare module 'vue' {
     // see: https://github.com/vuejs/vue-next/issues/1553
     //      https://github.com/vuejs/vue-next/issues/3029
     onBlur?: EventHandler;
+    onOpen?: EventHandler;
     onEdit?: EventHandler;
+    onClose?: EventHandler;
     onFocus?: EventHandler;
     onInput?: EventHandler;
     onClick?: EventHandler;
     onPress?: EventHandler;
     onCancel?: EventHandler;
+    onOpened?: EventHandler;
     onClosed?: EventHandler;
     onChange?: EventHandler;
     onSubmit?: EventHandler;