57 lines
1.3 KiB
JavaScript
57 lines
1.3 KiB
JavaScript
/*
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* Copyright (c) 2010-2018 Tim Düsterhus.
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*
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* Use of this software is governed by the Business Source License
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* included in the LICENSE file.
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*
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* Change Date: 2024-11-01
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*
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* On the date above, in accordance with the Business Source
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* License, use of this software will be governed by version 2
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* or later of the General Public License.
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*/
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define([], function () {
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'use strict'
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const listeners = new WeakMap()
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const EventEmitter = function (target) {
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Object.assign(target, {
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on(type, listener, options = {}) {
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if (!listeners.has(this)) {
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listeners.set(this, new Map())
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}
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if (!listeners.get(this).has(type)) {
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listeners.get(this).set(type, new Set())
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}
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if (!options.once) options.once = false
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listeners.get(this).get(type).add({ listener, options })
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},
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off(type, listener) {
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listeners.get(this).get(type).delete(listener)
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},
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emit(type, detail = {}) {
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if (!listeners.has(this)) return
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if (!listeners.get(this).has(type)) return
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const set = listeners.get(this).get(type)
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set.forEach(
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function ({ listener, options }) {
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if (options.once) {
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set.delete(listener)
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}
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listener({ target: this, detail })
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}.bind(this)
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)
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},
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})
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}
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return EventEmitter
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})
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