Jonathan Staab
37 lines
995 B
TypeScript
37 lines
995 B
TypeScript
export type EventBusHandler = (...args: any[]) => void
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export type EventBusListener = {
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id: string
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handler: EventBusHandler
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}
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export class EventBus {
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static ANY = Math.random().toString().slice(2)
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listeners: Record<string, Array<EventBusListener>> = {}
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on(name: string, handler: EventBusHandler) {
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const id = Math.random().toString().slice(2)
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this.listeners[name] = this.listeners[name] || ([] as Array<EventBusListener>)
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this.listeners[name].push({id, handler})
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return id
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}
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off(name: string, id: string) {
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this.listeners[name] = this.listeners[name].filter(l => l.id !== id)
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}
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clear() {
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this.listeners = {}
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}
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handle(k: string, ...payload: any) {
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for (const {handler} of this.listeners[k] || []) {
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handler(...payload)
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}
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for (const {handler} of this.listeners[EventBus.ANY] || []) {
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handler(k, ...payload)
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}
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}
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pipe(k: string, bus: EventBus) {
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this.on(k, (...payload: any[]) => bus.handle(k, ...payload))
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}
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}
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