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f9871103bf
Reenable eslint `prefer-const` rule GitOrigin-RevId: 4f3825be8b8dff381095209085a36eaab76260d5
79 lines
2.3 KiB
JavaScript
79 lines
2.3 KiB
JavaScript
/* eslint-disable
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camelcase,
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max-len,
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no-return-assign,
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no-unused-vars,
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*/
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// TODO: This file was created by bulk-decaffeinate.
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// Fix any style issues and re-enable lint.
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/*
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* decaffeinate suggestions:
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* DS101: Remove unnecessary use of Array.from
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* DS102: Remove unnecessary code created because of implicit returns
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* DS207: Consider shorter variations of null checks
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* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
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*/
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// Simple event emitter implementation, but has a slightly unusual API for
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// removing specific listeners. If a specific listener needs to be removed
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// (instead of all listeners), then it needs to use a "namespace":
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// Create a listener on the foo event with bar namespace: .on 'foo.bar'
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// Trigger all events for the foo event (including namespaces): .trigger 'foo'
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// Remove all listeners for the foo event (including namespaces): .off 'foo'
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// Remove a listener for the foo event with the bar namespace: .off 'foo.bar'
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let EventEmitter
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export default EventEmitter = class EventEmitter {
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on(event, callback) {
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let namespace
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if (!this.events) {
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this.events = {}
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}
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;[event, namespace] = Array.from(event.split('.'))
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if (!this.events[event]) {
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this.events[event] = []
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}
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return this.events[event].push({
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callback,
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namespace,
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})
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}
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off(event) {
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if (!this.events) {
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this.events = {}
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}
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if (event != null) {
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let namespace
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;[event, namespace] = Array.from(event.split('.'))
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if (namespace == null) {
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// Clear all listeners for event
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return delete this.events[event]
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} else {
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// Clear only namespaced listeners
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const remaining_events = []
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for (const callback of Array.from(this.events[event] || [])) {
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if (callback.namespace !== namespace) {
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remaining_events.push(callback)
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}
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}
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return (this.events[event] = remaining_events)
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}
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} else {
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// Remove all listeners
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return (this.events = {})
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}
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}
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trigger(event, ...args) {
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if (!this.events) {
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this.events = {}
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}
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return Array.from(this.events[event] || []).map(callback =>
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callback.callback(...Array.from(args || []))
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)
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}
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emit(...args) {
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return this.trigger(...Array.from(args || []))
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}
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}
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