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/* eslint-disable node-core/require-common-first, node-core/required-modules */
'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;