import type { FrontMcpLogger } from '../../common';
import type { ChannelInstance } from '../channel.instance';
type EventHandler = (payload: unknown) => void;
/**
 * In-process event bus for app-event channel sources.
 *
 * Applications can emit events to this bus, and channels subscribed
 * to matching event names will receive them and push notifications.
 *
 * @example
 * ```typescript
 * // In your application code:
 * const eventBus = scope.channelEventBus;
 * eventBus.emit('error', { message: 'Connection failed', level: 'critical' });
 * eventBus.emit('deploy', { version: '1.2.3', status: 'success' });
 * ```
 */
export declare class ChannelEventBus {
    private readonly handlers;
    private readonly logger;
    constructor(logger: FrontMcpLogger);
    /**
     * Subscribe to events of a specific name.
     *
     * @param event - The event name to subscribe to
     * @param handler - The handler function called with the event payload
     * @returns Unsubscribe function
     */
    on(event: string, handler: EventHandler): () => void;
    /**
     * Emit an event to all subscribed handlers.
     *
     * @param event - The event name
     * @param payload - The event payload
     */
    emit(event: string, payload: unknown): void;
    /**
     * Remove all handlers.
     */
    clear(): void;
    /**
     * Get the number of registered event types.
     */
    get eventCount(): number;
}
/**
 * Wires an app-event channel source to the ChannelEventBus.
 *
 * @param channel - The channel instance to push notifications to
 * @param eventName - The event name to subscribe to
 * @param eventBus - The event bus instance
 * @param logger - Logger instance
 * @returns Unsubscribe function
 */
export declare function wireAppEventSource(channel: ChannelInstance, eventName: string, eventBus: ChannelEventBus, logger: FrontMcpLogger): () => void;
export {};
//# sourceMappingURL=app-event.source.d.ts.map