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28 lines
609 B
28 lines
609 B
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const events_1 = require("events");
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class Counter extends events_1.EventEmitter {
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constructor() {
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super();
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this.value = 0;
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}
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increment() {
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this.value++;
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}
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decrement() {
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if (--this.value === 0) {
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this.emit('zero');
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}
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}
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isZero() {
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return this.value === 0;
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}
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onceZero(fn) {
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if (this.isZero()) {
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return fn();
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}
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this.once('zero', fn);
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}
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}
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exports.default = Counter;
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//# sourceMappingURL=counter.js.map
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