如何使用AWS Lambda nodejs将数据推送/设置到firebase中？

Question

我对aws lambda很新，我不确定如何使用它将数据设置到firebase中。以下是我目前的代码：

var firebase = require("firebase");

exports.handler = (event, context, callback) => {
context.callbackWaitsForEmptyEventLoop = false;  

var config = {
    apiKey: "cannot be shown",
    authDomain: "cannot be shown",
    databaseURL: "cannot be shown",
    projectId: "cannot be shown",
    storageBucket: "cannot be shown",
    messagingSenderId: "cannot be shown"
};

if(firebase.apps.length === 0) {   
    firebase.initializeApp(config);
}

exports.handler = (event, context, callback) => {
    firebase.database().ref('/').set({
    username: "test",
    email: "test@mail.com"
    });

    callback(null, 'Hello from Lambda'); 
};

};

由此，我怎么能这样做或者我的代码做错了？