refector(EventBus): splite EventBus type definition and its implemention

src/startup_scripts/EventBus.js

@@ -0,0 +1,43 @@
+/**
+ * Create a simple event bus for handling custom events in KubeJS environment.
+ * @returns {EventBus}
+ */
+function createEventBus() {
+    /**
+     * @type {EventBus}
+     */
+    const bus = {
+        eventMap: {},
+
+        register: function (eventName, callback) {
+            this.eventMap[eventName] = callback;
+        },
+
+        emit: function (eventName, event) {
+            const callback = this.eventMap[eventName];
+            if (callback) {
+                return callback(event);
+            }
+        },
+    };
+
+    return bus;
+}
+
+global["eventBus"] = createEventBus();
+
+// ==================== Forge Event Listeners ====================
+
+ForgeEvents.onEvent(
+    "net.minecraftforge.event.entity.living.LivingEntityUseItemEvent$Finish",
+    (event) => {
+        eventBus.emit("LivingEntityUseItemEvent$Finish", event);
+    },
+);
+
+ForgeEvents.onEvent(
+    "net.minecraftforge.event.entity.player.ItemFishedEvent",
+    (event) => {
+        eventBus.emit("PlayerItemFishedEvent", event);
+    },
+);