chore(components): [date-picker] export instasnce type (#13618)

* chore(components): [date-picker] export instasnce type

* move DatePickerInstance to instance.ts

packages/components/date-picker/index.ts

@@ -13,3 +13,4 @@ export default _DatePicker
 export const ElDatePicker = _DatePicker
 export * from './src/constants'
 export * from './src/props/date-picker'
+export type { DatePickerInstance } from './src/instance'

packages/components/date-picker/src/date-picker.tsx

@@ -18,6 +18,7 @@ import { ROOT_PICKER_INJECTION_KEY } from './constants'
 
 import { datePickerProps } from './props/date-picker'
 import { getPanel } from './panel-utils'
+import type { DatePickerExpose } from './instance'
 
 dayjs.extend(localeData)
 dayjs.extend(advancedFormat)
@@ -43,7 +44,7 @@ export default defineComponent({
     })
 
     const commonPicker = ref<InstanceType<typeof CommonPicker>>()
-    const refProps = {
+    const refProps: DatePickerExpose = {
       focus: (focusStartInput = true) => {
         commonPicker.value?.focus(focusStartInput)
       },

packages/components/date-picker/src/instance.ts

@@ -0,0 +1,12 @@
+import type { ComponentPublicInstance } from 'vue'
+import type { DatePickerProps } from './props/date-picker'
+
+export type DatePickerExpose = {
+  focus: (focusStartInput: boolean) => void
+  handleOpen: () => void
+  handleClose: () => void
+}
+export type DatePickerInstance = ComponentPublicInstance<
+  DatePickerProps,
+  DatePickerExpose
+>