Add events to SlashCommandAbortController

public/scripts/slash-commands/AbstractEventTarget.js

@@ -0,0 +1,36 @@
+/**
+ * @abstract
+ * @implements {EventTarget}
+ */
+export class AbstractEventTarget {
+    constructor() {
+        this.listeners = {};
+    }
+
+    addEventListener(type, callback, _options) {
+        if (!this.listeners[type]) {
+            this.listeners[type] = [];
+        }
+        this.listeners[type].push(callback);
+    }
+
+    dispatchEvent(event) {
+        if (!this.listeners[event.type] || this.listeners[event.type].length === 0) {
+            return true;
+        }
+        this.listeners[event.type].forEach(listener => {
+            listener(event);
+        });
+        return true;
+    }
+
+    removeEventListener(type, callback, _options) {
+        if (!this.listeners[type]) {
+            return;
+        }
+        const index = this.listeners[type].indexOf(callback);
+        if (index !== -1) {
+            this.listeners[type].splice(index, 1);
+        }
+    }
+}