Fix item filters being ignored

src/js/game/components/belt.js

@@ -2,8 +2,6 @@ import { enumDirection, Vector } from "../../core/vector";
 import { types } from "../../savegame/serialization";
 import { BeltPath } from "../belt_path";
 import { Component } from "../component";
-import { Entity } from "../entity";
-import { enumLayer } from "../root";
 
 export const curvedBeltLength = /* Math.PI / 4 */ 0.78;
 
@@ -43,7 +41,6 @@ export class BeltComponent extends Component {
     }
 
     static getSchema() {
-        // The followUpCache field is not serialized.
         return {
             direction: types.string,
         };
@@ -63,9 +60,6 @@ export class BeltComponent extends Component {
 
         this.direction = direction;
 
-        /** @type {Entity} */
-        this.followUpCache = null;
-
         /**
          * The path this belt is contained in, not serialized
          * @type {BeltPath}

src/js/game/components/hub.js

@@ -1,6 +1,4 @@
 import { Component } from "../component";
-import { ShapeDefinition } from "../shape_definition";
-import { types } from "../../savegame/serialization";
 
 export class HubComponent extends Component {
     static getId() {

src/js/game/components/item_acceptor.js

@@ -2,7 +2,6 @@ import { enumDirection, enumInvertedDirections, Vector } from "../../core/vector
 import { types } from "../../savegame/serialization";
 import { BaseItem, enumItemType } from "../base_item";
 import { Component } from "../component";
-import { enumLayer } from "../root";
 
 /** @typedef {{
  * pos: Vector,