feat: Added WPP.chat.getLastSeen function (#546)

src/chat/functions/getLastSeen.ts

@@ -0,0 +1,41 @@
+/*!
+ * Copyright 2021 WPPConnect Team
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { assertWid } from '../../assert';
+import { ChatStore, Wid } from '../../whatsapp';
+
+/**
+ * Get timestamp of last seen
+ * @example
+ * ```javascript
+ * WPP.chat.getLastSeen('[number]@c.us');
+ * ```
+ * @category Chat
+ */
+export async function getLastSeen(
+  chatId: string | Wid
+): Promise<number | boolean> {
+  const wid = assertWid(chatId);
+  const chat = await ChatStore.get(wid);
+  if (!chat) {
+    return false;
+  }
+  if (!chat.presence.hasData) {
+    await chat.presence.subscribe();
+    await new Promise((resolve) => setTimeout(resolve, 100));
+  }
+  return chat.presence.chatstate.t || false;
+}

src/chat/functions/index.ts

@@ -23,6 +23,7 @@ export { downloadMedia } from './downloadMedia';
 export { find } from './find';
 export { generateMessageID } from './generateMessageID';
 export { get } from './get';
+export { getLastSeen } from './getLastSeen';
 export { getMessageById } from './getMessageById';
 export { getMessages, GetMessagesOptions } from './getMessages';
 export { ChatListOptions, list } from './list';