65 lines
2.2 KiB
TypeScript
65 lines
2.2 KiB
TypeScript
export type TypedListener = (...args: any[]) => any;
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export type TypedEvents = {[k in string | symbol]: TypedListener} & {'*': (event: string, ...args: any[]) => any};
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export type NamespaceEvents<Namespace extends string, Events extends TypedEvents> = {
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[K in keyof Events as `${Namespace}:${Extract<K, string>}`]: Events[K];
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};
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export class TypedEmitter<T extends TypedEvents = TypedEvents> {
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private static listeners: {[key: string]: TypedListener[]} = {};
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private listeners: { [key in keyof T]?: TypedListener[] } = {};
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static emit(event: any, ...args: any[]) {
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(this.listeners['*'] || []).forEach(l => l(event, ...args));
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(this.listeners[event.toString()] || []).forEach(l => l(...args));
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};
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static off(event: any, listener: TypedListener) {
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const e = event.toString();
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this.listeners[e] = (this.listeners[e] || []).filter(l => l === listener);
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}
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static on(event: any, listener: TypedListener) {
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const e = event.toString();
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if(!this.listeners[e]) this.listeners[e] = [];
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this.listeners[e]?.push(listener);
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return () => this.off(event, listener);
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}
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static once(event: any, listener?: TypedListener): Promise<any> {
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return new Promise(res => {
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const unsubscribe = this.on(event, <any>((...args: any) => {
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res(args.length == 1 ? args[0] : args);
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if(listener) listener(...args);
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unsubscribe();
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}));
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});
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}
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emit<K extends keyof T>(event: K, ...args: Parameters<T[K]>) {
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(this.listeners['*'] || []).forEach(l => l(event, ...args));
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(this.listeners[event] || []).forEach(l => l(...args));
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};
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off<K extends keyof T = string>(event: K, listener: T[K]) {
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this.listeners[event] = (this.listeners[event] || []).filter(l => l === listener);
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}
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on<K extends keyof T = string>(event: K, listener: T[K]) {
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if(!this.listeners[event]) this.listeners[event] = [];
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this.listeners[event]?.push(listener);
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return () => this.off(event, listener);
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}
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once<K extends keyof T = string>(event: K, listener?: T[K]): Promise<any> {
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return new Promise(res => {
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const unsubscribe = this.on(event, <any>((...args: any) => {
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res(args.length == 1 ? args[0] : args);
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if(listener) listener(...args);
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unsubscribe();
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}));
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});
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}
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}
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