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34 lines
1.1 KiB
TypeScript
34 lines
1.1 KiB
TypeScript
export type EventMap = Record<string, any>;
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type EventKey<T extends EventMap> = string & keyof T;
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type EventReceiver<T> = (params: T) => void;
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export interface Emitter<T extends EventMap> {
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on<K extends EventKey<T>>(eventName: K, fn: EventReceiver<T[K]>): void;
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off<K extends EventKey<T>>(eventName: K, fn: EventReceiver<T[K]>): void;
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emit<K extends EventKey<T>>(eventName: K, params: T[K]): void;
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}
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export interface Listener<T extends EventMap> {
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on<K extends EventKey<T>>(eventName: K, fn: EventReceiver<T[K]>): void;
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off<K extends EventKey<T>>(eventName: K, fn: EventReceiver<T[K]>): void;
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}
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export function makeEmitter<T extends EventMap>(): Emitter<T> {
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const listeners: Partial<
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Record<EventKey<T>, ((...params: any[]) => void)[]>
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> = {};
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return {
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on(eventName, fn) {
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if (!listeners[eventName]) listeners[eventName] = [];
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listeners[eventName]?.push(fn);
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},
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off(eventName, fn) {
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listeners[eventName] =
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listeners[eventName]?.filter((v) => v !== fn) ?? [];
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},
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emit(eventName, params) {
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(listeners[eventName] ?? []).forEach((fn) => fn(params));
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},
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};
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}
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