MontageJS Application
Global Configuration
Define global constants to be used app-wide via Application.delegate, which observes your app’s loading state.
- Define custom app delegate with your desired name in serialization in 
index.htmlthen assign toApplication.delegate: 
{
    "application": {
        "prototype": "montage/core/application",
        "properties": {
            "delegate": {"@": "customAppDelegate"}
        }
    },
    "customAppDelegate": {
        "prototype": "custom-app-delegate"
    }
}
- Define custom app delegate class in 
custom-app-delegate.js. Define config values in itswillFinishLoadingmethod: 
var Montage = require("montage/core/core").Montage;
exports.AppDelegate = Montage.specialize({
    willFinishLoading: {value: function (app) {
        // can assign any property to app with any name
        app.config = {
            // Define app-wide global config var here
            // e.g. DEBUG_MODE, etc.
            APP_VERSION: 1
        };
    }}
});
- Now you can get the config values anywhere in the app, e.g. in 
ui/main.reel/main.js 
var Component = require("montage/ui/component").Component;
exports.Main = Component.specialize({
    constructor: {value: function () {
        console.log(this.application.config.APP_VERSION); // 1
    }}
});