var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/*<replacement>*/

require('babel-polyfill');

var util = require('util');

for (var i in util) {

exports[i] = util[i];

} /*</replacement>*/ /*<replacement>*/

if (!global.setImmediate) {

global.setImmediate = function setImmediate(fn) {

return setTimeout(fn.bind.apply(fn, arguments), 4);

};

}

if (!global.clearImmediate) {

global.clearImmediate = function clearImmediate(i) {

return clearTimeout(i);

};

}

/*</replacement>*/

/* eslint-disable required-modules */

'use strict';

/*<replacement>*/

var objectKeys = objectKeys || function (obj) {

var keys = [];

for (var key in obj) {

keys.push(key);

}return keys;

};

/*</replacement>*/

var assert = require('assert');

var kLimit = Symbol('limit');

var kCallback = Symbol('callback');

var Countdown = function () {

function Countdown(limit, cb) {

_classCallCheck(this, Countdown);

assert.strictEqual(typeof limit, 'number');

assert.strictEqual(typeof cb, 'function');

this[kLimit] = limit;

this[kCallback] = cb;

}

Countdown.prototype.dec = function dec() {

assert(this[kLimit] > 0, 'Countdown expired');

if (--this[kLimit] === 0) this[kCallback]();

return this[kLimit];

};

_createClass(Countdown, [{

key: 'remaining',

get: function () {

return this[kLimit];

}

}]);

return Countdown;

}();

module.exports = Countdown;

function forEach(xs, f) {

for (var i = 0, l = xs.length; i < l; i++) {

f(xs[i], i);

}

}