import type { ObservationRepository } from "../db/observations";
import type { SessionRepository } from "../db/sessions";
import type { SummaryRepository } from "../db/summaries";
import type { UserObservationRepository } from "../db/user-memory";
import type { Observation, OpenMemConfig } from "../types";
/** Build a plain-text section highlighting key decisions from observations. */
export declare function buildDecisionsSection(decisions: Observation[]): string;
/** Build a plain-text section with compressed full observation details. */
export declare function buildFullObservationsSection(observations: Observation[]): string;
/** Create the session compaction hook that injects memory context during compaction. */
export declare function createCompactionHook(config: OpenMemConfig, observations: ObservationRepository, sessions: SessionRepository, summaries: SummaryRepository, projectPath: string, userObservationRepo?: UserObservationRepository | null): (_input: {
    sessionID: string;
}, output: {
    context: string[];
    prompt?: string;
}) => Promise<void>;
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