feat: mark chat as unread (#475)

Co-authored-by: Pedro S. Lopez <pedroslopez@me.com>

index.d.ts

@@ -99,6 +99,9 @@ declare namespace WAWebJS {
         /** Mark as seen for the Chat */
         sendSeen(chatId: string): Promise<boolean>
 
+        /** Mark the Chat as unread */
+        markChatUnread(chatId: string): Promise<void>
+
         /** 
          * Sets the current user's status message
          * @param status New status message
@@ -777,6 +780,8 @@ declare namespace WAWebJS {
         unmute: () => Promise<void>,
         /** Returns the Contact that corresponds to this Chat. */
         getContact: () => Promise<Contact>,
+        /** Marks this Chat as unread */
+        markUnread: () => Promise<void>
         /** Returns array of all Labels assigned to this Chat */
         getLabels: () => Promise<Label[]>
     }

src/Client.js

@@ -689,6 +689,17 @@ class Client extends EventEmitter {
         }, chatId);
     }
 
+    /**
+     * Mark the Chat as unread
+     * @param {string} chatId ID of the chat that will be marked as unread
+     */
+    async markChatUnread(chatId) {
+        await this.pupPage.evaluate(async chatId => {
+            let chat = await window.Store.Chat.get(chatId);
+            await window.Store.Cmd.markChatUnread(chat, true);
+        }, chatId);
+    }
+
     /**
      * Returns the contact ID's profile picture URL, if privacy settings allow it
      * @param {string} contactId the whatsapp user's ID

src/structures/Chat.js

@@ -161,6 +161,13 @@ class Chat extends Base {
         return this.client.unmuteChat(this.id._serialized);
     }
 
+    /**
+     * Mark this chat as unread
+     */
+    async markUnread(){
+        return this.client.markChatUnread(this.id._serialized);
+    }
+
     /**
      * Loads chat messages, sorted from earliest to latest.
      * @param {Object} searchOptions Options for searching messages. Right now only limit is supported.