feat: allow broadcast notifications

Signed-off-by: Heikki Hellgren <heikki.hellgren@op.fi>

plugins/notifications-node/src/service/DefaultNotificationService.ts

@@ -27,9 +27,14 @@ export type NotificationServiceOptions = {
   signalService: SignalService;
 };
 
+/** @public */
+export type NotificationReceivers =
+  | { type: 'entity'; entityRef: string | string[] }
+  | { type: 'broadcast' };
+
 /** @public */
 export type NotificationSendOptions = {
-  entityRef: string | string[];
+  receivers: NotificationReceivers;
   title: string;
   description: string;
   link: string;

plugins/notifications-node/src/service/NotificationService.ts

@@ -18,6 +18,6 @@ import { NotificationSendOptions } from './DefaultNotificationService';
 import { Notification } from '@backstage/plugin-notifications-common';
 
 /** @public */
-export type NotificationService = {
+export interface NotificationService {
   send(options: NotificationSendOptions): Promise<Notification[]>;
-};
+}