/** Represents a subscription that can be cancelled */
export interface Subscription {
    /** Cancels the subscription and removes the listener */
    unsubscribe(): void;
}
/**
 * Generic event emitter for pub/sub pattern with type-safe events
 * @template T The event payload type (defaults to void for events without data)
 */
export declare class EventEmitter<T = void> {
    #private;
    /**
     * Subscribes a listener to events
     * @param listener Function to call when events are emitted
     * @returns Subscription object to cancel the listener
     */
    subscribe(listener: (event: T) => void): Subscription;
    /**
     * Emits an event to all subscribed listeners
     * @param event The event payload to send to listeners
     */
    emit(event: T): void;
    /** Removes all listeners */
    clear(): void;
    /** Returns the current number of active listeners */
    get listenerCount(): number;
}
/**
 * Manages multiple subscriptions as a single unit for batch cleanup
 * Useful for managing event listeners that should all be cleaned up together
 */
export declare class SubscriptionManager implements Subscription {
    #private;
    /**
     * Adds one or more subscriptions to manage
     * @param subscriptions Subscriptions to add to the manager
     */
    add(...subscriptions: Subscription[]): void;
    /** Unsubscribes from all managed subscriptions */
    unsubscribe(): void;
    /** Returns whether all subscriptions have been unsubscribed */
    get isUnsubscribed(): boolean;
}