/**
 * Simple event emitter for lifecycle hooks
 */
export declare class EventEmitter {
    private events;
    /**
     * Register an event listener
     */
    on(event: string, listener: (...args: any[]) => void | Promise<void>): void;
    /**
     * Unregister an event listener
     */
    off(event: string, listener: (...args: any[]) => void | Promise<void>): void;
    /**
     * Emit an event
     */
    emit(event: string, ...args: any[]): Promise<void>;
    /**
     * Remove all listeners for an event, or all events if no event specified
     */
    removeAllListeners(event?: string): void;
}
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