refactor(heartbeat): share reply payload picker

src/auto-reply/heartbeat-reply-payload.ts

@@ -0,0 +1,22 @@
+import type { ReplyPayload } from "./types.js";
+
+export function resolveHeartbeatReplyPayload(
+  replyResult: ReplyPayload | ReplyPayload[] | undefined,
+): ReplyPayload | undefined {
+  if (!replyResult) {
+    return undefined;
+  }
+  if (!Array.isArray(replyResult)) {
+    return replyResult;
+  }
+  for (let idx = replyResult.length - 1; idx >= 0; idx -= 1) {
+    const payload = replyResult[idx];
+    if (!payload) {
+      continue;
+    }
+    if (payload.text || payload.mediaUrl || (payload.mediaUrls && payload.mediaUrls.length > 0)) {
+      return payload;
+    }
+  }
+  return undefined;
+}