style(theme-default): fix eslint warning

Author: meteorlxy

packages/@vuepress/theme-default/src/composables/useThemeData.ts

@@ -2,7 +2,13 @@ import {
   useThemeData as _useThemeData,
   useThemeLocaleData as _useThemeLocaleData,
 } from '@vuepress/plugin-theme-data/lib/composables'
+import type {
+  ThemeDataRef,
+  ThemeLocaleDataRef,
+} from '@vuepress/plugin-theme-data/lib/composables'
 import type { DefaultThemeData } from '../types'
 
-export const useThemeData = () => _useThemeData<DefaultThemeData>()
-export const useThemeLocaleData = () => _useThemeLocaleData<DefaultThemeData>()
+export const useThemeData = (): ThemeDataRef<DefaultThemeData> =>
+  _useThemeData<DefaultThemeData>()
+export const useThemeLocaleData = (): ThemeLocaleDataRef<DefaultThemeData> =>
+  _useThemeLocaleData<DefaultThemeData>()