Implement announce

And bug fixes

src/models/note.ts

@@ -112,7 +112,7 @@ export const pack = async (
 		_note = deepcopy(note);
 	}
 
-	if (!_note) throw 'invalid note arg.';
+	if (!_note) throw `invalid note arg ${note}`;
 
 	const id = _note._id;
 

src/models/notification.ts

@@ -51,9 +51,6 @@ export interface INotification {
 
 /**
  * Pack a notification for API response
- *
- * @param {any} notification
- * @return {Promise<any>}
  */
 export const pack = (notification: any) => new Promise<any>(async (resolve, reject) => {
 	let _notification: any;