:bug: missing declaration for type check on single oops

vue-theme/src/pages/single.vue

@@ -47,7 +47,7 @@ import breadcrumb from '@/components/breadcrumb'
 
 import { postTypeGetters, scrollTop, heroUtils } from './mixin-post-types'
 
-import { convertTitleCase, formatDate } from '@/utils/helpers'
+import { postTypes, convertTitleCase, formatDate } from '@/utils/helpers'
 
 const TIMEOUT = 1