Access Firebase From AWS Lambda Function

awsLambdaToFirebase.js

'use strict';

var firebase = require("firebase");

exports.handler = (event, context, callback) => {
    context.callbackWaitsForEmptyEventLoop = false;  //<---Important

    var config = {
        apiKey: "<<apikey>>",
        authDomain: "<<app_id>>.firebaseapp.com",
        databaseURL: "https://<<app_id>>.firebaseio.com",
        storageBucket: "<<app_id>>.appspot.com",
    };

    if(firebase.apps.length == 0) {   // <---Important!!! In lambda, it will cause double initialization.
        firebase.initializeApp(config);
    }

    ...
    <Your Logic here...>
    ...
};