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* AuroraView SDK Event System
*
* Provides a type-safe event emitter with proper unsubscribe support.
*/
import type { EventHandler, Unsubscribe } from './types';
/**
* Event emitter with unsubscribe support
*/
export class EventEmitter {
private handlers = new Map<string, Set<EventHandler>>();
/**
* Subscribe to an event
* @param event - Event name
* @param handler - Event handler function
* @returns Unsubscribe function
*/
on<T = unknown>(event: string, handler: EventHandler<T>): Unsubscribe {
if (!this.handlers.has(event)) {
this.handlers.set(event, new Set());
}
const handlers = this.handlers.get(event)!;
handlers.add(handler as EventHandler);
// Return unsubscribe function
return () => {
handlers.delete(handler as EventHandler);
if (handlers.size === 0) {
this.handlers.delete(event);
}
};
}
/**
* Subscribe to an event once
* @param event - Event name
* @param handler - Event handler function
* @returns Unsubscribe function
*/
once<T = unknown>(event: string, handler: EventHandler<T>): Unsubscribe {
const wrapper: EventHandler<T> = (data) => {
unsubscribe();
handler(data);
};
const unsubscribe = this.on(event, wrapper);
return unsubscribe;
}
/**
* Emit an event to all handlers
* @param event - Event name
* @param data - Event data
*/
emit<T = unknown>(event: string, data: T): void {
const handlers = this.handlers.get(event);
if (!handlers) return;
handlers.forEach((handler) => {
try {
handler(data);
} catch (e) {
console.error(`[AuroraView] Error in event handler for "${event}":`, e);
}
});
}
/**
* Remove event handler(s)
* @param event - Event name
* @param handler - Optional specific handler to remove
*/
off(event: string, handler?: EventHandler): void {
if (handler) {
this.handlers.get(event)?.delete(handler);
} else {
this.handlers.delete(event);
}
}
/**
* Check if event has handlers
* @param event - Event name
*/
hasHandlers(event: string): boolean {
const handlers = this.handlers.get(event);
return handlers !== undefined && handlers.size > 0;
}
/**
* Get handler count for an event
* @param event - Event name
*/
handlerCount(event: string): number {
return this.handlers.get(event)?.size ?? 0;
}
/**
* Remove all handlers
*/
clear(): void {
this.handlers.clear();
}
}
/** Singleton event emitter instance */
let globalEmitter: EventEmitter | null = null;
/**
* Get the global event emitter instance
*/
export function getGlobalEmitter(): EventEmitter {
if (!globalEmitter) {
globalEmitter = new EventEmitter();
}
return globalEmitter;
}
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