/**
 * Hook/lifecycle event system for Iron Rain plugins.
 */
export type HookEvent = "onToolCall" | "onToolResult" | "onSessionStart" | "onSessionEnd" | "onCommit" | "onError" | "onCheckpoint" | "beforeDispatch" | "afterDispatch";
export type HookHandler = (data: HookEventData) => void | Promise<void>;
export interface HookEventData {
    event: HookEvent;
    timestamp: number;
    payload: Record<string, unknown>;
}
/**
 * Emits lifecycle hooks to registered handlers.
 */
export declare class HookEmitter {
    private handlers;
    /**
     * Register a handler for a specific event.
     */
    on(event: HookEvent, handler: HookHandler): () => void;
    /**
     * Emit an event to all registered handlers.
     */
    emit(event: HookEvent, payload?: Record<string, unknown>): Promise<void>;
    /**
     * Remove all handlers for a specific event.
     */
    off(event: HookEvent): void;
    /**
     * Remove all handlers.
     */
    clear(): void;
    /**
     * Get count of registered handlers for an event.
     */
    listenerCount(event: HookEvent): number;
}
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