31 lines
700 B
JavaScript
31 lines
700 B
JavaScript
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import fastCall from './fast-call.js';
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export default class EventEmitter {
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$$listeners = {};
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addListener(type, listener) {
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if (!this.$$listeners[type]) {
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this.$$listeners[type] = new Set();
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}
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this.$$listeners[type].add(listener);
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}
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invoke(type, ...args) {
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const listeners = this.$$listeners[type];
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if (!listeners) {
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return;
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}
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for (const listener of listeners) {
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fastCall(listener, undefined, args);
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}
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}
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removeListener(type, listener) {
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const listeners = this.$$listeners[type];
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if (!listeners) {
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return;
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}
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listeners.delete(listener);
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if (0 === listeners.size) {
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delete this.$$listeners[type];
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}
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}
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}
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