feature(startup): add custom Event Bus

src/startup_scripts/event_register.js

@@ -0,0 +1,61 @@
+/**
+ * A simple event bus for handling custom events in KubeJS environment.
+ * @namespace
+ */
+const eventBus = {
+    /**
+     * Map storing event names and their corresponding callback functions.
+     * @type {{[key: string]: Function}}
+     */
+    eventMap: {},
+
+    /**
+     * Registers a callback function for a specific event.
+     * @overload
+     * @param {"LivingEntityUseItemEvent$Finish"} eventName - The name of the event to listen for.
+     * @param {(event: Internal.LivingEntityUseItemEvent$Finish) => any} callback - The callback function.
+     * @returns {void}
+     */
+    /**
+     * Registers a callback function for a specific event.
+     * @param {string} eventName - The name of the event to listen for.
+     * @param {Function} callback - The callback function to execute when the event is emitted.
+     * @returns {void}
+     */
+    register: function (eventName, callback) {
+        this.eventMap[eventName] = callback;
+    },
+
+    /**
+     * Emits an event, calling the registered callback function if it exists.
+     * @overload
+     * @param {"LivingEntityUseItemEvent$Finish"} eventName - The name of the event to emit.
+     * @param {Internal.LivingEntityUseItemEvent$Finish} event - The event data.
+     * @returns {any}
+     */
+    /**
+     * Emits an event, calling the registered callback function if it exists.
+     * @param {string} eventName - The name of the event to emit.
+     * @param {*} event - The event data to pass to the callback function.
+     * @returns {*} The return value of the callback function, or undefined if no callback is registered.
+     */
+    emit: function (eventName, event) {
+        const callback = this.eventMap[eventName];
+        if (callback) {
+            return callback(event);
+        }
+    },
+};
+
+/**
+ * @typedef {typeof eventBus} EventBus
+ */
+
+global["eventBus"] = eventBus;
+
+ForgeEvents.onEvent(
+    "net.minecraftforge.event.entity.living.LivingEntityUseItemEvent$Finish",
+    (event) => {
+        eventBus.emit("LivingEntityUseItemEvent$Finish", event);
+    },
+);