export type FoldRestingState = "open" | "closed";
/** Provide a per-timeline resting-state map (MessageTimeline owns one). */
export declare const FoldMemoryProvider: import("react").Provider<Map<string, FoldRestingState> | null>;
/** The ancestor fold-memory map, or null when none is mounted (inert). */
export declare function useFoldMemory(): Map<string, FoldRestingState> | null;
/**
 * Single-cluster activity→turn wrap: copy the activity resting state onto the
 * new turn-* key. Those ids differ across the wrap; without this the turn
 * remounts settleFold and re-opens a chip the reader already watched collapse.
 *
 * Multi-cluster wraps deliberately do NOT inherit — the outer turn chip is new
 * and still takes one settle beat; nested clusters keep their own activity-*
 * memory so they stay closed under that beat.
 */
export declare function inheritFoldRestingState(memory: Map<string, FoldRestingState>, targetKey: string, sourceKeys: readonly string[]): void;