add support heartbeat to couchdb-changes-stream

services/message-delivery-method-web-push/src/setupVapidDetails.ts

@@ -3,10 +3,10 @@ import { serverSettingsDb } from "./dbs";
 import { ServerSettingsDocument } from "@hereconnect/types";
 
 function isType<N extends ServerSettingsDocument["name"]>(
-  doc: ServerSettingsDocument,
+  doc: ServerSettingsDocument | null | undefined,
   name: N,
 ): doc is ServerSettingsDocument & { name: N } {
-  return doc.name === name;
+  return !!(doc && doc.name === name);
 }
 
 export const setupVapidDetails = async () => {
@@ -53,9 +53,10 @@ export const setupVapidDetails = async () => {
   );
 
   changes.on("change", (change) => {
-    if (!("doc" in change)) {
+    if (!change.doc) {
       return;
     }
+
     if (isType(change.doc, "message_delivery_method_web_push_vapid")) {
       console.log("update vapid details");
       webpush.setVapidDetails(