// Defines a module that works in Node and AMD.
(function (define) {
    define(function (require, exports, module) {

        function RecurringPromise(factory, step) {
            this.timer = null;
            this.factory = factory;
            this.step = step;
            this.shouldStop = false;
        }

        RecurringPromise.prototype.loop = function () {
            var self = this;
            this.promise = new Promise(function (resolve, reject) {
                function step() {
                    self.timer = null;
                    self.factory()
                        .then(resolve, function () {
                            if (self.shouldStop) reject.apply(null, arguments);
                            else self.timer = setTimeout(step, self.step || 100);
                        });
                }

                step();
            });
            return this.promise;
        };

        RecurringPromise.prototype.stop = function () {
            this.shouldStop = true;
            return this.promise || Promise.resolve();
        };

        RecurringPromise.prototype.stopAndForget = function () {
            return this.stop().catch(function () {
            });
        };

        return RecurringPromise;
    });

}( // Help Node out by setting up define.
    typeof module === 'object' && module.exports && typeof define !== 'function'
        ? function (factory) {
        module.exports = factory(require, exports, module);
    }
        : define
));