fix(2.0): adjust frontend typings

Author: DavideIadeluca

js/src/forum/extenders/addFrontSort.ts

@@ -2,6 +2,7 @@ import { extend } from 'flarum/common/extend';
 import DiscussionListState from 'flarum/forum/states/DiscussionListState';
 
 import type { PaginatedListParams } from 'flarum/common/states/PaginatedListState';
+import type { SortMap } from 'flarum/common/states/PaginatedListState';
 
 export default function () {
   extend(DiscussionListState.prototype, 'requestParams', function (this: DiscussionListState, params: PaginatedListParams) {
@@ -14,7 +15,7 @@ export default function () {
     }
   });
 
-  extend(DiscussionListState.prototype, 'sortMap', function (map: Record<string, string>) {
+  extend(DiscussionListState.prototype, 'sortMap', function (map: SortMap) {
     map.front = '-frontdate';
   });
 }