import type { SessionManager } from "@earendil-works/pi-coding-agent";
import { type ServerFrame, type TimelineEvent } from "../protocol/v2/index.js";
type RecoveryFn = (sessionManager: SessionManager) => readonly TimelineEvent[];
type GenerationProvider = (sessionManager: SessionManager) => string;
type HistorySyncRequest = {
    requestId: string;
    targetChannelId: string;
    before: number | null;
    limit?: number;
};
export type TimelineHistorySync = HistorySyncRequest;
export type TimelineHistoryRecovery = RecoveryFn;
export type TimelineHistoryGenerationProvider = GenerationProvider;
export declare class TimelineHistoryPager {
    private readonly sessionManager;
    private readonly recoverFn;
    private readonly generationProvider;
    constructor(sessionManager: SessionManager, recoverFn: RecoveryFn, generationProvider?: GenerationProvider);
    sync(request: HistorySyncRequest): ServerFrame[];
    private validateRequest;
    private captureSnapshot;
    private snapshotInvalidReason;
    private recoverRecords;
    private selectWindow;
    private fragmentWindow;
    private makeChunk;
    private nonFinalFrameBytes;
    private finalFrameBytes;
    private protocolError;
    private reset;
}
export {};