firebase-copy 
Create a copy of the Firebase constructor with its own global state
Install
$ npm install --save firebase firebase-copy
Usage
var firebaseCopy = require('firebase-copy');
var Firebase = require('firebase');
var Firebase1 = firebaseCopy();
var Firebase2 = firebaseCopy();
// Firebase1 and Firebase2 will behave just like Firebase, but without the shared state.
var ref1a = new Firebase1('https://my-firebase.firebaseio.com/some-path');
var ref1b = new Firebase1('https://my-firebase.firebaseio.com/some-path');
var ref2 = new Firebase2('https://my-firebase.firebaseio.com/some-path');
ref1a.on('value', () => console.log('1a'));
ref1b.on('value', () => console.log('1b'));
ref2.on('value', () => console.log('2'));
ref1a.set('some-value');
console.log('end');
// output is:
// 1a
// 1b
// end
// 2In the above example ref1a and ref1b share some global state with each other, so listeners fire synchronously
without round-tripping to the server. ref2 must wait for data to round-trip to the server before seeing it's listener
fire.
Essentially, ref2 behaves like it is on a completely different machine from ref1a and ref1b.
This is useful for testing interactions of multiple clients from a single machine.
License
MIT © James Talmage
