整理した

src/models/favorite.ts

@@ -0,0 +1,12 @@
+import * as mongo from 'mongodb';
+import db from '../db/mongodb';
+
+const Favorites = db.get<IFavorite>('favorites');
+export default Favorites;
+
+export type IFavorite = {
+	_id: mongo.ObjectID;
+	createdAt: Date;
+	userId: mongo.ObjectID;
+	postId: mongo.ObjectID;
+};