sse typing

src/index.ts

@@ -1,5 +1,7 @@
 export * from "./fastify.js";
 export * from "./homeassistant.js";
 export * from "./logger.js";
+export * from "./sse.js";
 export * from "./tidal.js";
 export * from "./timehelper.js";
+

src/sse.ts

@@ -0,0 +1,43 @@
+import { logInfo } from "./logger";
+
+export interface SseClient {
+	id: number;
+	send: (data: SseEvent) => void;
+}
+
+export interface SseEvent {
+	type: string;
+	data?: unknown;
+	message?: string;
+}
+
+export class SseService {
+	private clients = new Set<SseClient>();
+
+	addClient(client: SseClient): void {
+		this.clients.add(client);
+		logInfo(
+			`SSE client connected: ${client.id}. Total clients: ${this.clients.size}`,
+		);
+	}
+
+	removeClient(clientId: number): void {
+		const client = [...this.clients].find((c) => c.id === clientId);
+		if (client) {
+			this.clients.delete(client);
+			logInfo(
+				`SSE client disconnected: ${clientId}. Total clients: ${this.clients.size}`,
+			);
+		}
+	}
+
+	notifyClients(event: SseEvent): void {
+		this.clients.forEach((client) => {
+			client.send(event);
+		});
+	}
+
+	getClientCount(): number {
+		return this.clients.size;
+	}
+}