diff --git a/components/tooltip/Tooltip.jsx b/components/tooltip/Tooltip.tsx
similarity index 95%
rename from components/tooltip/Tooltip.jsx
rename to components/tooltip/Tooltip.tsx
index e5f915109..9e05524fa 100644
--- a/components/tooltip/Tooltip.jsx
+++ b/components/tooltip/Tooltip.tsx
@@ -1,4 +1,4 @@
-import { inject } from 'vue';
+import { defineComponent, inject } from 'vue';
 import VcTooltip from '../vc-tooltip';
 import classNames from '../_util/classNames';
 import getPlacements from './placements';
@@ -15,7 +15,7 @@ import { cloneElement } from '../_util/vnode';
 import { defaultConfigProvider } from '../config-provider';
 import abstractTooltipProps from './abstractTooltipProps';
 
-const splitObject = (obj, keys) => {
+const splitObject = (obj: any, keys: string[]) => {
   const picked = {};
   const omitted = { ...obj };
   keys.forEach(key => {
@@ -27,13 +27,14 @@ const splitObject = (obj, keys) => {
   return { picked, omitted };
 };
 const props = abstractTooltipProps();
-export default {
+export default defineComponent({
   name: 'ATooltip',
   inheritAttrs: false,
   props: {
     ...props,
-    title: PropTypes.any,
+    title: PropTypes.VNodeChild,
   },
+  emits: ['update:visible', 'visibleChange'],
   setup() {
     return {
       configProvider: inject('configProvider', defaultConfigProvider),
@@ -61,7 +62,7 @@ export default {
     },
 
     getPopupDomNode() {
-      return this.$refs.tooltip.getPopupDomNode();
+      return (this.$refs.tooltip as any).getPopupDomNode();
     },
 
     getPlacements() {
@@ -209,4 +210,4 @@ export default {
       </VcTooltip>
     );
   },
-};
+});
diff --git a/components/tooltip/abstractTooltipProps.js b/components/tooltip/abstractTooltipProps.ts
similarity index 64%
rename from components/tooltip/abstractTooltipProps.js
rename to components/tooltip/abstractTooltipProps.ts
index a4b9b53ea..3889572a7 100644
--- a/components/tooltip/abstractTooltipProps.js
+++ b/components/tooltip/abstractTooltipProps.ts
@@ -1,27 +1,31 @@
 import PropTypes from '../_util/vue-types';
-const triggerType = PropTypes.oneOf(['hover', 'focus', 'click', 'contextmenu']);
+import { tuple } from '../_util/type';
+const triggerType = PropTypes.oneOf(tuple('hover', 'focus', 'click', 'contextmenu'));
+
 export default () => ({
   trigger: PropTypes.oneOfType([triggerType, PropTypes.arrayOf(triggerType)]).def('hover'),
   visible: PropTypes.looseBool,
   defaultVisible: PropTypes.looseBool,
-  placement: PropTypes.oneOf([
-    'top',
-    'left',
-    'right',
-    'bottom',
-    'topLeft',
-    'topRight',
-    'bottomLeft',
-    'bottomRight',
-    'leftTop',
-    'leftBottom',
-    'rightTop',
-    'rightBottom',
-  ]).def('top'),
+  placement: PropTypes.oneOf(
+    tuple(
+      'top',
+      'left',
+      'right',
+      'bottom',
+      'topLeft',
+      'topRight',
+      'bottomLeft',
+      'bottomRight',
+      'leftTop',
+      'leftBottom',
+      'rightTop',
+      'rightBottom',
+    ),
+  ).def('top'),
   transitionName: PropTypes.string.def('zoom-big-fast'),
-
   overlayStyle: PropTypes.object.def(() => ({})),
   overlayClassName: PropTypes.string,
+  openClassName: PropTypes.string,
   prefixCls: PropTypes.string,
   mouseEnterDelay: PropTypes.number.def(0.1),
   mouseLeaveDelay: PropTypes.number.def(0.1),
@@ -31,7 +35,6 @@ export default () => ({
   destroyTooltipOnHide: PropTypes.looseBool.def(false),
   align: PropTypes.object.def(() => ({})),
   builtinPlacements: PropTypes.object,
-  children: PropTypes.any,
+  children: PropTypes.VNodeChild,
   onVisibleChange: PropTypes.func,
-  'onUpdate:visible': PropTypes.func,
 });
diff --git a/components/tooltip/index.js b/components/tooltip/index.ts
similarity index 68%
rename from components/tooltip/index.js
rename to components/tooltip/index.ts
index c1909f7ec..a3b35afd7 100644
--- a/components/tooltip/index.js
+++ b/components/tooltip/index.ts
@@ -1,7 +1,8 @@
+import { App } from 'vue';
 import ToolTip from './Tooltip';
 
 /* istanbul ignore next */
-ToolTip.install = function(app) {
+ToolTip.install = function(app: App) {
   app.component(ToolTip.name, ToolTip);
   return app;
 };
diff --git a/components/tooltip/placements.js b/components/tooltip/placements.ts
similarity index 100%
rename from components/tooltip/placements.js
rename to components/tooltip/placements.ts
diff --git a/components/tooltip/style/index.js b/components/tooltip/style/index.ts
similarity index 100%
rename from components/tooltip/style/index.js
rename to components/tooltip/style/index.ts