Promises in Typescript

promises.ts

const data: ILiveData[] = await <any>MongoService.findOne('live', {});

findOne: async (collection: string, query: any) => {
  return new Promise((resolve: any) => {
    database.collection(collection).findOne(query, (error: Error, res: any) => {
      if (error) {
        throw error;
      }
      resolve(res);
    });
  });
},