Firebase variable that can be accessed globally

@gigocabrera wrote:

In my ionic 1 app I had the following global variable in the app.js file

/* FIREBASE */
var fb = new Firebase("https://brilliant-inferno-1044.firebaseio.com");

From the factories.js I was able to reference it as follows: ref = fb.child("houses");

How can I do the same in ionic 2? Should it live in the constructor of the class for the app.js file in ionic2?

this.firebaseUrl = "https://brilliant-inferno-1044.firebaseio.com"; (maybe?)

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