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'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;