Fix declaration bug found by new TS version

Author: Perryvw

build/lua/utils.ts

@@ -91,6 +91,7 @@ const typePredicates: Record<string, string> = {
   'CDOTA_PlayerResource.IsValidTeamPlayerID': 'playerId is PlayerID',
   'CBaseEntity.IsPlayerController': 'this is CDOTAPlayerController',
   'CBaseEntity.IsPlayerPawn': 'this is CBasePlayerPawn',
+  'CDOTA_Item.IsItem': 'this is CDOTA_Item',
   'CDOTABaseAbility.IsItem': 'this is CDOTA_Item',
   'ProjectileManager.IsValidProjectile': 'value is ProjectileID',
 };

package.json

@@ -48,7 +48,7 @@
     "npm-run-all": "^4.1.5",
     "prettier": "^2.1.2",
     "ts-node": "^10.9.1",
-    "typescript": "^5.0.4",
+    "typescript": "^5.5.2",
     "wordwrap": "^1.0.0"
   },
   "version": "0.1.0"

packages/dota-lua-types/types/api.generated.d.ts

@@ -3491,7 +3491,7 @@ declare interface CDOTA_Item extends CDOTABaseAbility {
     /** @both */
     IsInBackpack(): boolean;
     /** @both */
-    IsItem(): boolean;
+    IsItem(): this is CDOTA_Item;
     /** @both */
     IsKillable(): boolean;
     /** @both */