added a workaround for mods

this should allow mod devs to work around the semi-hacky logic for item accepting by registering "filters" in the MOD_ITEM_FILTERS object in item_ejector.js

src/js/game/belt_path.js

@@ -11,6 +11,7 @@ import { BaseItem } from "./base_item";
 import { Entity } from "./entity";
 import { typeItemSingleton } from "./item_resolver";
 import { GameRoot } from "./root";
+import { MOD_ITEM_FILTERS } from "./systems/item_ejector";
 
 const logger = createLogger("belt_path");
 
@@ -315,7 +316,7 @@ export class BeltPath extends BasicSerializableObject {
         const systems = this.root.systemMgr.systems;
         const hubGoals = this.root.hubGoals;
 
-        // NOTICE: THIS IS COPIED FROM THE ITEM EJECTOR SYSTEM FOR PEROFMANCE REASONS
+        // NOTICE: THIS IS COPIED FROM THE ITEM EJECTOR SYSTEM FOR PERFORMANCE REASONS
 
         const itemProcessorComp = entity.components.ItemProcessor;
         if (itemProcessorComp) {
@@ -361,6 +362,21 @@ export class BeltPath extends BasicSerializableObject {
                 }
             };
         }
+
+        return function (item) {
+            // it could be a custom mod case
+            // let's check if it is any of them
+            var any = false; // so that all matching components can process it
+            for (let id in MOD_ITEM_FILTERS) {
+                if (entity.components[id]) {
+                    let handler = MOD_ITEM_FILTERS[id];
+                    if (handler(item, entity, matchingSlotIndex)) any = true;
+                    else return false;
+                }
+            }
+
+            return any;
+        };
     }
 
     // Following code will be compiled out outside of dev versions

src/js/game/systems/item_ejector.js

@@ -14,6 +14,12 @@ import { MapChunkView } from "../map_chunk_view";
 
 const logger = createLogger("systems/ejector");
 
+/**
+ * Key is component id, value is function to handle whether or not item can enter.
+ * @type {Object<string, (item: BaseItem, reciever: Entity, slot: number) => boolean>}
+ */
+export const MOD_ITEM_FILTERS = {};
+
 export class ItemEjectorSystem extends GameSystemWithFilter {
     constructor(root) {
         super(root, [ItemEjectorComponent]);
@@ -294,7 +300,18 @@ export class ItemEjectorSystem extends GameSystemWithFilter {
             }
         }
 
-        return false;
+        // it could be a custom mod case
+        // let's check if it is any of them
+        var any = false; // so that all matching components can process it
+        for (let id in MOD_ITEM_FILTERS) {
+            if (receiver.components[id]) {
+                let handler = MOD_ITEM_FILTERS[id];
+                if (handler(item, receiver, slotIndex)) any = true;
+                else return false;
+            }
+        }
+
+        return any;
     }
 
     /**