'use strict';
const assert = require('assert');const kLimit = Symbol('limit');const kCallback = Symbol('callback');const common = require('./');
class Countdown { constructor(limit, cb) { assert.strictEqual(typeof limit, 'number'); assert.strictEqual(typeof cb, 'function'); this[kLimit] = limit; this[kCallback] = common.mustCall(cb); }
dec() { assert(this[kLimit] > 0, 'Countdown expired'); if (--this[kLimit] === 0) this[kCallback](); return this[kLimit]; }
get remaining() { return this[kLimit]; }}
module.exports = Countdown;