pathfinder/js/app/promises/promise.deferred.js

define([], () => {
    'use strict';

    /**
     * Deferred Promise implementation
     * @see https://stackoverflow.com/a/47112177/4329969
     */
    return class DeferredPromise {

        constructor(){
            this._promise = new Promise((resolve, reject) => {
                // assign the resolve and reject functions to `this`
                // making them usable on the class instance
                this.resolve = resolve;
                this.reject = reject;
            });

            // bind `then` and `catch` to implement the same interface as Promise
            this.then = this._promise.then.bind(this._promise);
            this.catch = this._promise.catch.bind(this._promise);
        }

        set data(data){
            if(data){
                this._data = data;
            }

            return this._data;
        }

        get data(){
            return this._data;
        }

        get [Symbol.toStringTag]() {
            return 'Promise';
        }
    };
});