import { type SessionStore } from "../storage/session-store.js";
import type { SessionMode } from "../activity/tracker.js";
import type { TokenOptimizerConfig } from "../util/env.js";
export interface Checkpoint {
    sessionId: string;
    trigger: string;
    mode: SessionMode;
    qualityScore: number | null;
    fillPct: number | null;
    activeFiles: string[];
    decisions: string[];
    content: string;
    createdAt: number;
}
export declare function captureCheckpoint(store: SessionStore, sessionId: string, trigger: string, mode: SessionMode, qualityScore: number | null, fillPct: number | null, 
/** Recent user messages from session state — used to enrich checkpoint content
 *  with topic keywords so non-code/strategy sessions can clear the 0.6
 *  relevance threshold during cross-session restore. Caller sanitizes nothing;
 *  buildTopicSummary() handles all sanitization here. */
recentUserMessages?: string[]): Checkpoint;
export declare function pruneCheckpoints(store: SessionStore, config: TokenOptimizerConfig): number;
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