import type { CompressionBlock, PruneMessagesState, PrunedMessageEntry, SessionState, WithParts } from "./types";
export declare const isMessageCompacted: (state: SessionState, msg: WithParts) => boolean;
interface PersistedPruneMessagesState {
    byMessageId: Record<string, PrunedMessageEntry>;
    blocksById: Record<string, CompressionBlock>;
    activeBlockIds: number[];
    activeByAnchorMessageId: Record<string, number>;
    nextBlockId: number;
    nextRunId: number;
}
export declare function serializePruneMessagesState(messagesState: PruneMessagesState): PersistedPruneMessagesState;
export declare function isSubAgentSession(client: any, sessionID: string): Promise<boolean>;
export declare function findLastCompactionTimestamp(messages: WithParts[]): number;
export declare function countTurns(state: SessionState, messages: WithParts[]): number;
export declare function loadPruneMap(obj?: Record<string, number>): Map<string, number>;
export declare function createPruneMessagesState(): PruneMessagesState;
export declare function loadPruneMessagesState(persisted?: PersistedPruneMessagesState): PruneMessagesState;
export declare function collectTurnNudgeAnchors(messages: WithParts[]): Set<string>;
export declare function getActiveSummaryTokenUsage(state: SessionState): number;
export declare function resetOnCompaction(state: SessionState): void;
export {};
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