Add empty NPC data type

src/main/typescript/constants.ts

@@ -274,7 +274,8 @@ export function isSkillName(name: string): name is SkillName {
 export const TYPES = {
   /** Type names for Actor types */
   ACTOR: {
-    CHARACTER: "character"
+    CHARACTER: "character",
+    NPC: "npc"
   },
   /** Type names for Item types */
   ITEM: {

src/main/typescript/data/actor/npc/source.ts

@@ -0,0 +1,8 @@
+import type { TYPES } from "../../../constants.js";
+
+export default interface NpcDataSource {
+  type: typeof TYPES.ACTOR.NPC;
+  data: NpcDataSourceData;
+}
+
+export class NpcDataSourceData {}

src/main/typescript/data/actor/source.ts

@@ -1,3 +1,4 @@
 import type CharacterDataSource from "./character/source.js";
+import type NpcDataSource from "./npc/source.js";
 
-export type WvActorDataSource = CharacterDataSource;
+export type WvActorDataSource = CharacterDataSource | NpcDataSource;