import type { PreviousTurnSignal } from "../../agent/continue-orient.js";
import type { TranscriptItem } from "../../app/ports/transcript-item.js";
import type { ChatMessage, ProviderId, ReasoningPreference } from "../../types.js";
import type { HistorySummary } from "../history-index.js";
export declare function jsonlFilePath(): string;
export declare function jsonlIndexFilePath(): string;
export declare function backupDirPath(): string;
export interface PersistedContextUsage {
    contextTokens: number;
    contextLimit?: number | undefined;
    lastCompletionTokens?: number | undefined;
    sessionPromptTokens?: number | undefined;
    sessionCompletionTokens?: number | undefined;
    exact: boolean;
    contextSnapshot?: import("../../llm/context-snapshot.js").ContextSnapshotV1 | undefined;
    routeUsage?: readonly import("../../app/controllers/session-usage-ledger.js").PersistedRouteUsage[] | undefined;
}
export interface HistoryRecord {
    id: string;
    writerGeneration?: string | undefined;
    revision?: number | undefined;
    name?: string | undefined;
    createdAt: string;
    updatedAt: string;
    cwd: string;
    messages: ChatMessage[];
    transcript?: TranscriptItem[] | undefined;
    contextUsage?: PersistedContextUsage | undefined;
    previousTurn?: PreviousTurnSignal | undefined;
    workspaceFolder?: string | undefined;
    workspaceCode?: string | undefined;
    provider?: ProviderId | undefined;
    model?: string | undefined;
    thinking?: ReasoningPreference | undefined;
}
export declare let cachedSessionList: {
    historyDir: string;
    summaries: HistorySummary[];
    cachedAt: number;
    coversAll: boolean;
} | undefined;
export declare let sessionListGeneration: number;
export declare function invalidateSessionListCache(): void;
export declare function hydrateHistoryRecord(record: HistoryRecord): HistoryRecord;
export declare function historyRevision(record: HistoryRecord | undefined): number;
export declare function historyWriterGeneration(record: HistoryRecord | undefined): string | undefined;
export declare function compareHistoryFreshness(left: HistoryRecord, right: HistoryRecord): number;
export declare function dedupeHistoryById(records: readonly HistoryRecord[]): HistoryRecord[];
export declare function sortHistoryByUpdatedDesc(records: readonly HistoryRecord[]): HistoryRecord[];
export declare function readJsonlRecordsFrom(path: string): Promise<HistoryRecord[]>;
export declare function backupActiveHistory(): Promise<void>;
export declare function recoverOrphanedHistory(): Promise<{
    recovered: number;
    sources: string[];
}>;
export declare function startHistoryRecovery(): Promise<void>;
export declare function ensureHistoryRecovered(): Promise<void>;
export declare function setCachedSessionList(value: {
    historyDir: string;
    summaries: HistorySummary[];
    cachedAt: number;
    coversAll: boolean;
} | undefined): void;