fix: query deindexing

app/ecs/ecs.test.js

@@ -170,10 +170,16 @@ test('ticks systems', async () => {
     .to.deep.equal(JSON.stringify({y: 128 + 30}));
 });
 
-test('schedules entities to be deleted when ticking systems', () => {
+test('schedules entities to be deleted when ticking systems', async () => {
   const ecs = new Ecs({
+    Components: {Empty},
     Systems: {
       Despawn: class extends System {
+        static queries() {
+          return {
+            default: ['Empty'],
+          };
+        }
         tick() {
           this.ecs.destroy(1);
           expect(ecs.get(1))
@@ -183,8 +189,10 @@ test('schedules entities to be deleted when ticking systems', () => {
     },
   });
   ecs.system('Despawn').active = true;
-  ecs.create();
+  await ecs.create({Empty: {}});
   ecs.tick(1);
+  expect(Array.from(ecs.system('Despawn').select('default')))
+    .to.have.lengthOf(0);
   expect(ecs.get(1))
     .to.be.undefined;
 });

app/ecs/query.js

@@ -24,8 +24,8 @@ export default class Query {
   }
 
   deindex(entityIds) {
-    for (let i = 0; i < entityIds.length; ++i) {
+    for (const entityId of entityIds) {
-      this.$$index.delete(entityIds[i]);
+      this.$$index.delete(entityId);
     }
   }