Code cleaning.

src/js/repository/mongoClient.js

@@ -40,7 +40,7 @@ class MongoClient {
     }
 
     delete(collectionName, entityId, callback) {
-        this.db.collection(collectionName).deleteOne({_id: mongodb.ObjectId(entityId)}, (error, result) => {
+        this.db.collection(collectionName).deleteOne({_id: mongodb.ObjectId(entityId)}, (error) => {
             assert.equal(null, error, `Unable to delete ${collectionName} entity with id ${entityId}: ${error}.`);
             console.log(`Entity ${collectionName} with id ${entityId} deleted.`);
             callback();

src/js/repository/repository.js

@@ -21,6 +21,6 @@ class Repository {
     delete(entityId, callback) {
         this.mongoClient.delete(this.collectionName, entityId, callback);
     }
-};
+}
 
 module.exports = Repository;