feat(utils): add event emitter utility

Co-authored-by: DHV Team <dhvteam@users.noreply.github.com>

Author: maitamdev

src/utils/eventEmitter.ts

@@ -0,0 +1,22 @@
+// Simple event emitter for app-wide events
+type EventHandler = (...args: unknown[]) => void;
+class EventEmitter {
+  private events: Map<string, EventHandler[]> = new Map();
+  on(event: string, handler: EventHandler): () => void {
+    if (!this.events.has(event)) this.events.set(event, []);
+    this.events.get(event)!.push(handler);
+    return () => this.off(event, handler);
+  }
+  off(event: string, handler: EventHandler): void {
+    const handlers = this.events.get(event);
+    if (handlers) this.events.set(event, handlers.filter(h => h !== handler));
+  }
+  emit(event: string, ...args: unknown[]): void {
+    this.events.get(event)?.forEach(handler => handler(...args));
+  }
+  once(event: string, handler: EventHandler): void {
+    const wrapper = (...args: unknown[]) => { handler(...args); this.off(event, wrapper); };
+    this.on(event, wrapper);
+  }
+}
+export const appEvents = new EventEmitter();