import type { QueryClient } from '@tanstack/react-query';
export interface SessionStreamEngineOptions {
    sessionId: string;
    queryClient: QueryClient;
    /**
     * Whether this session currently drives global, single-session UI state
     * (viewer tabs, tool approvals, secure input prompts). Background engines
     * keep the query caches fresh without touching that UI.
     */
    isActive: () => boolean;
}
/**
 * Applies one session's SSE events to the React Query caches. Hook-free so a
 * stream can stay attached while its session runs in the background and no
 * chunks are lost while the user is viewing another session.
 *
 * Returns a cleanup function that detaches from the shared event stream.
 */
export declare function startSessionStreamEngine({ sessionId, queryClient, isActive, }: SessionStreamEngineOptions): () => void;
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