Boolean filter improvement alternative: TS upgrade (#4840)

* upgrade typescript and use new feature

* fix: typing error

src/state/queries/post-feed.ts

@@ -375,11 +375,11 @@ export function usePostFeedQuery(
                         }
                         return undefined
                       })
-                      .filter(<T>(n?: T): n is T => Boolean(n)),
+                      .filter(n => !!n),
                   }
                   return feedPostSlice
                 })
-                .filter(<T>(n?: T): n is T => Boolean(n)),
+                .filter(n => !!n),
             })),
           ],
         }

src/state/queries/threadgate.ts

@@ -33,6 +33,6 @@ export function threadgateViewToSettings(
       }
       return setting
     })
-    .filter(<T>(n?: T): n is T => Boolean(n))
+    .filter(n => !!n)
   return settings
 }