/**
 * Outbound SSE visibility for session `reasoningLevel`.
 * Single choke point: call from the queue push path so agent subscribe stays free of policy branches.
 *
 * Note: Does not alter persisted messages or agent state; history/UI may still strip thinking separately.
 */
import type { ReasoningLevel } from '../transcript/thinking-types.js';
export type SseStreamEvent = {
    type: string;
    [key: string]: unknown;
};
/**
 * @returns `null` to drop the event; unchanged `event` otherwise.
 */
export declare function applyReasoningVisibilityToSseEvent(event: SseStreamEvent, reasoningLevel: ReasoningLevel): SseStreamEvent | null;
