refactor: improve type safety in World and tests

Replace `any` types with specific interfaces like `WorldEvent`,
`QueryUpdate`, and `Entity` to strengthen type checking. This includes
refining the deserialization logic in `World.fromSnapshot` to use
properly typed component definitions.

src/world.ts

@@ -7,6 +7,7 @@ import { ObservableLayer } from "./observable/observe";
 import type { QueryUpdate, RelationshipUpdate } from "./observable/events";
 import type { RelationshipDef } from "./relationship";
 import { Observable } from "rxjs";
+import type { WorldEvent } from "./observable/events";
 import type { WorldSnapshot } from "./serialization";
 
 // ── World ─────────────────────────────────────────────
@@ -40,7 +41,7 @@ export class World {
   private _observable = new ObservableLayer();
 
   /** Global event stream. */
-  get events$(): Observable<any> {
+  get events$(): Observable<WorldEvent> {
     return this._observable.events$.asObservable();
   }
 
@@ -435,7 +436,10 @@ export class World {
   ): World {
     const world = new World();
 
-    const compByName = new Map(components.map((c) => [c.name, c]));
+    const compByName = new Map(components.map((c) => [c.name, c])) as Map<
+      string,
+      ComponentDef<Record<string, unknown>>
+    >;
     const relByName = new Map((relationships ?? []).map((r) => [r.name, r]));
 
     // Map string ids → real Entity handles
@@ -453,7 +457,8 @@ export class World {
               `Pass it in the components array.`,
           );
         }
-        world.add(entity, def, value as any);
+        // Unknown at deserialization boundary; shape matches ComponentDef.defaults
+        world.add(entity, def, value as Partial<Record<string, unknown>>);
       }
     }
 

test/serialization.test.ts

@@ -6,6 +6,7 @@ import {
   type WorldSnapshot,
   query,
   type RelationshipUpdate,
+  type WorldEvent,
 } from "../src/index";
 
 // ── Definitions ─────────────────────────────────────
@@ -269,8 +270,9 @@ describe("Serialization — complex state", () => {
     const playerId = snap.relationships.ownedBy[bulletId];
 
     // Player should have a name
-    expect(snap.entities[playerId]).toHaveProperty("name");
-    expect((snap.entities[playerId].name as any).value).toBe("Hero");
+    const playerComps = snap.entities[playerId];
+    expect(playerComps).toHaveProperty("name");
+    expect((playerComps.name as { value: string }).value).toBe("Hero");
   });
 });
 
@@ -403,8 +405,8 @@ describe("Serialization — observables after load", () => {
     w.spawn();
 
     const loaded = roundTrip(w);
-    const events: any[] = [];
-    loaded.events$.subscribe((e: any) => events.push(e));
+    const events: WorldEvent[] = [];
+    loaded.events$.subscribe((e) => events.push(e));
 
     const e = loaded.spawn();
     expect(events).toHaveLength(1);
@@ -417,8 +419,8 @@ describe("Serialization — observables after load", () => {
     w.add(e, Position, { x: 1, y: 2 });
 
     const loaded = roundTrip(w);
-    const updates: any[] = [];
-    loaded.observe(query(Position)).subscribe((u: any) => {
+    const updates: QueryUpdate[] = [];
+    loaded.observe(query(Position)).subscribe((u) => {
       if (u.added.length || u.removed.length || u.changed.length) {
         updates.push(u);
       }

test/world.test.ts

@@ -5,6 +5,7 @@ import {
   query,
   type QueryUpdate,
   type WorldEvent,
+  type Entity,
 } from "../src/index";
 
 // ── Components ──────────────────────────────────────
@@ -84,11 +85,11 @@ describe("Entity lifecycle", () => {
 // ── Components ──────────────────────────────────────
 describe("Components", () => {
   let world: World;
-  let entity = 0 as any;
+  let entity: Entity;
 
   beforeEach(() => {
     world = new World();
-    entity = world.spawn();
+    entity = world.spawn() as Entity;
   });
 
   it("add returns defaults", () => {