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src/api/sse.js

@@ -8,15 +8,16 @@
 /** @type {Set<SseClient>} */
 const clients = new Set();
 
-const KEEP_ALIVE_MS = 25_000;
+const KEEP_ALIVE_MS = 20_000;
 
 /**
  * Register an open SSE response. Caller must write the initial headers.
  * @param {import('express').Response} res
  * @param {{ companyId: number, userId: number }} meta
+ * @param {import('express').Request} [req]
  * @returns {() => void} unsubscribe
  */
-export function subscribe(res, { companyId, userId }) {
+export function subscribe(res, { companyId, userId }, req) {
     /** @type {SseClient} */
     const client = {
         res,
@@ -24,7 +25,7 @@ export function subscribe(res, { companyId, userId }) {
         userId,
         keepAlive: setInterval(() => {
             if (res.writableEnded) return;
-            res.write(': keepalive\n\n');
+            res.write(': heartbeat\n\n');
         }, KEEP_ALIVE_MS),
     };
     clients.add(client);
@@ -35,6 +36,7 @@ export function subscribe(res, { companyId, userId }) {
     };
 
     res.on('close', unsubscribe);
+    req?.on('close', unsubscribe);
     return unsubscribe;
 }