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https://github.com/yu-i-i/overleaf-cep.git
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2fbb4615f9
* Convert event-tracking to TypeScript * Convert local-storage to TypeScript * Convert mapSeries to TypeScript * Convert SessionStorage to TypeScript * Convert account-upgrade to TypeScript * Convert isValidTeXFile to TypeScript * Convert date functions to TypeScript * Convert EventEmitter to TypeScript * Convert isNetworkError to TypeScript * Convert webpack-public-path to TypeScript * Convert displayNameForUser to TypeScript GitOrigin-RevId: 79c5a2d1101fcd520f3116f0f4af29d974189d94
78 lines
2 KiB
TypeScript
78 lines
2 KiB
TypeScript
// 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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export default class EventEmitter {
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events: Record<
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string,
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{
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callback: (...args: any[]) => void
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namespace: string
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}[]
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>
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constructor() {
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this.events = {}
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}
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on(event: string, callback: (...args: any[]) => void) {
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if (!this.events) {
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this.events = {}
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}
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let namespace
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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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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?: string, callback?: (...args: any[]) => void) {
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if (!this.events) {
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this.events = {}
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}
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if (event) {
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let namespace
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;[event, namespace] = 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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if (callback) {
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this.events[event] = this.events[event].filter(
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e => e.callback !== callback
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)
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} else if (!namespace) {
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// Clear all listeners for event
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delete this.events[event]
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} else {
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// Clear only namespaced listeners
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this.events[event] = this.events[event].filter(
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e => e.namespace !== namespace
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)
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}
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} else {
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// Remove all listeners
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this.events = {}
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}
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}
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trigger(event: string, ...args: any[]) {
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if (!this.events) {
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this.events = {}
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}
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if (this.events[event]) {
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this.events[event].forEach(e => e.callback(...args))
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}
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}
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emit(event: string, ...args: any[]) {
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this.trigger(event, ...args)
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}
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}
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