Firebase Realtime Database is a cloud-hosted NoSQL database. Data is stored as JSON and can be accessed in your Web, iOS, Android app using Google's Firebase SDK. But, Google doesn't provide such SDK for Apps Script. This library solves that problem. It gives you Firebase SDK for Apps Script.
Recently, Google announced that Apps Script will support V8 runtime. This lets apps script developers to take advantage of modern JavaScript features such as Promise. Firefast leverages these features to achieve 2 goals: