75c691b788This adds a implicit common.mustCall to the callback provided to the countdown. PR-URL: https://github.com/nodejs/node/pull/18506 Reviewed-By: Anatoli Papirovski <apapirovski@mac.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
29 lines
628 B
JavaScript
29 lines
628 B
JavaScript
/* eslint-disable required-modules */
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'use strict';
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const assert = require('assert');
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const kLimit = Symbol('limit');
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const kCallback = Symbol('callback');
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const common = require('./');
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class Countdown {
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constructor(limit, cb) {
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assert.strictEqual(typeof limit, 'number');
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assert.strictEqual(typeof cb, 'function');
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this[kLimit] = limit;
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this[kCallback] = common.mustCall(cb);
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}
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dec() {
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assert(this[kLimit] > 0, 'Countdown expired');
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if (--this[kLimit] === 0)
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this[kCallback]();
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return this[kLimit];
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}
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get remaining() {
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return this[kLimit];
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}
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}
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module.exports = Countdown;
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