refactor(components): [autocomplete] improve typings (#7381)

* refactor(components): [autocomplete] improve typings

* fix: rename

packages/components/autocomplete/src/autocomplete.ts

@@ -10,6 +10,18 @@ import { UPDATE_MODEL_EVENT } from '@element-plus/constants'
 import type { ExtractPropTypes } from 'vue'
 import type Autocomplete from './autocomplete.vue'
 import type { Placement } from '@element-plus/components/popper'
+import type { Awaitable } from '@element-plus/utils'
+
+export type AutocompleteData = { value: string }[]
+export type AutocompleteFetchSuggestionsCallback = (
+  data: AutocompleteData
+) => void
+export type AutocompleteFetchSuggestions =
+  | ((
+      queryString: string,
+      cb: AutocompleteFetchSuggestionsCallback
+    ) => Awaitable<AutocompleteData> | void)
+  | AutocompleteData
 
 export const autocompleteProps = buildProps({
   valueKey: {
@@ -37,13 +49,7 @@ export const autocompleteProps = buildProps({
     default: 'bottom-start',
   },
   fetchSuggestions: {
-    type: definePropType<
+    type: definePropType<AutocompleteFetchSuggestions>([Function, Array]),
-      | ((
-          queryString: string,
-          cb: (data: { value: string }[]) => void
-        ) => { value: string }[] | Promise<{ value: string }[]> | void)
-      | { value: string }[]
-    >([Function, Array]),
     default: NOOP,
   },
   popperClass: {