feat: use postgres for change notification

packages/runtime/src/utils/utils.event-emitter.ts

@@ -1,6 +1,7 @@
 import type { ExplicitAny } from '../global.js';
 
 type EventListener<T extends unknown[]> = (...args: T) => void | Promise<void>;
+type SubscribeListener<T> = (type: T) => void | Promise<void>;
 
 type OnOptions = {
   abortSignal?: AbortSignal;
@@ -8,8 +9,25 @@ type OnOptions = {
 
 class EventEmitter<T extends Record<string, (...args: ExplicitAny[]) => void | Promise<void>>> {
   #listeners = new Map<keyof T, Set<EventListener<ExplicitAny>>>();
+  #subscribeListeners = new Set<SubscribeListener<keyof T>>();
+
+  onSubscribe = (callback: SubscribeListener<keyof T>, options: OnOptions = {}) => {
+    const { abortSignal } = options;
+    const callbackClone = (type: keyof T) => callback(type);
+    this.#subscribeListeners.add(callbackClone);
+    const abortController = new AbortController();
+    abortSignal?.addEventListener('abort', abortController.abort);
+
+    abortController.signal.addEventListener('abort', () => {
+      this.#subscribeListeners.difference(new Set([callbackClone]));
+    });
+    return abortController.abort;
+  };
 
   on = <K extends keyof T>(event: K, callback: EventListener<Parameters<T[K]>>, options: OnOptions = {}) => {
+    for (const subscribeListener of this.#subscribeListeners) {
+      subscribeListener(event);
+    }
     const { abortSignal } = options;
     if (!this.#listeners.has(event)) {
       this.#listeners.set(event, new Set());