Add constant signal emitters

src/js/game/components/constant_signal.js

@@ -0,0 +1,30 @@
+import { gItemRegistry } from "../../core/global_registries";
+import { types } from "../../savegame/serialization";
+import { Component } from "../component";
+import { BaseItem } from "../base_item";
+
+export class ConstantSignalComponent extends Component {
+    static getId() {
+        return "ConstantSignal";
+    }
+
+    static getSchema() {
+        return {
+            signal: types.nullable(types.obj(gItemRegistry)),
+        };
+    }
+
+    duplicateWithoutContents() {
+        return new ConstantSignalComponent({ signal: this.signal });
+    }
+
+    /**
+     *
+     * @param {object} param0
+     * @param {BaseItem=} param0.signal The signal to store
+     */
+    constructor({ signal = null }) {
+        super();
+        this.signal = signal;
+    }
+}

src/js/game/components/item_acceptor.js

@@ -87,25 +87,7 @@ export class ItemAcceptorComponent extends Component {
      */
     canAcceptItem(slotIndex, item) {
         const slot = this.slots[slotIndex];
-        return this.filterMatches(slot.filter, item);
-    }
-
-    /**
-     * Returns if the given filter matches
-     * @param {enumItemType|null} filter
-     * @param {BaseItem} item
-     */
-    filterMatches(filter, item) {
-        if (!filter) {
-            return true;
-        }
-
-        const itemType = item.getItemType();
-        if (filter === enumItemType.genericEnergy) {
-            return itemType === enumItemType.positiveEnergy || itemType === enumItemType.negativeEnergy;
-        }
-
-        return itemType === filter;
+        return !slot.filter || slot.filter === item.getItemType();
     }
 
     /**