import { EventEmitter } from "node:events";
export interface EventBus {
emit(channel: string, data: unknown): void;
on(channel: string, handler: (data: unknown) => void): () => void;
}
export interface EventBusController extends EventBus {
clear(): void;
}
export function createEventBus(): EventBusController {
const emitter = new EventEmitter();
return {
emit: (channel, data) => {
emitter.emit(channel, data);
},
on: (channel, handler) => {
const safeHandler = async (data: unknown) => {
try {
await handler(data);
} catch (err) {
console.error(`Event handler error (${channel}):`, err);
}
};
emitter.on(channel, safeHandler);
return () => emitter.off(channel, safeHandler);
},
clear: () => {
emitter.removeAllListeners();
},
};
}