simple config to expose postal.js under $scope.$bus

scaffold.angular.config.postaljs-$bus.js

'use strict';
angular.module('myApp') // use whatever your app is using to load configs
    .config(['$provide', function ($provide) {
        $provide.decorator('$rootScope', [
            '$delegate', function ($delegate) {
            Object.defineProperty($delegate.constructor.prototype, 
            '$bus', {
                value: postal, // probably could wrap into window.postal but this works fine for me
                enumerable: false
            });

            return $delegate;
        }]);
    }]);
    
// @url https://github.com/postaljs/postal.js