add server to monorepo.

packages/server/src/lib/EventPublisher/EventPublisher.ts

@@ -0,0 +1,66 @@
+import { Container } from 'typedi';
+import { EventEmitter2 } from 'eventemitter2';
+
+interface IEventPublisherArgs {
+  subscribers: EventSubscriber[];
+}
+class PublishEvent {
+  constructor(public id: string) {}
+}
+
+type SubscribeListenerFunction = (event: PublishEvent) => void;
+type SubscribeFunction = (id: string, cb: SubscribeListenerFunction) => void;
+
+interface IEventBus {
+  subscribe: SubscribeFunction;
+}
+
+export abstract class EventSubscriber {
+  abstract attach(bus: IEventBus): void;
+}
+
+export class EventPublisher {
+  private emitter: EventEmitter2;
+
+  /**
+   *
+   * @param {IEventPublisherArgs} args
+   */
+  constructor() {
+    this.emitter = new EventEmitter2({ wildcard: true, delimiter: '.' });
+  }
+
+  /**
+   *
+   * @param {EventSubscriber} args
+   */
+  loadSubscribers(subscribers: EventSubscriber[]) {
+    const bus: IEventBus = {
+      subscribe: (id, cb) => {
+        this.emitter.on(id, cb);
+      },
+    };
+    for (const Subscriber of subscribers) {
+      const subscriberInstance = Container.get(Subscriber);
+      subscriberInstance.attach(bus);
+    }
+  }
+
+  /**
+   *
+   * @param event
+   * @param payload
+   */
+  emit(event: string, payload) {
+    return this.emitter.emit(event, payload);
+  }
+
+  /**
+   *
+   * @param event
+   * @param payload
+   */
+  emitAsync(event: string, payload) {
+    return this.emitter.emitAsync(event, payload);
+  }
+}