export declare const HEAD_BYTES: number;
export declare const TAIL_BYTES: number;
export declare const TITLE_MAX = 120;
export declare const TOOL_TEXT_MAX = 16000;
export declare const HISTORY_EVENT_PAYLOAD_MAX_CHARS = 32000;
export declare const SESSION_ID_RE: RegExp;
export interface HistoryEvent {
    id: string;
    seq: number;
    turn_id: string;
    type: string;
    payload: Record<string, unknown>;
    created_at: string;
}
export declare function isRecord(value: unknown): value is Record<string, any>;
export declare function truncate(text: string, max: number): string;
export declare function cleanTitle(text: string): string;
export declare function isSyntheticPrompt(text: string): boolean;
export declare function textOfBlocks(content: unknown): string;
export declare function parseJsonObject(value: unknown): Record<string, any> | null;
export declare function toEpochMs(value: unknown): number | null;
export declare function readChunk(path: string, position: number, length: number): Promise<string>;
export declare function parseLines(chunk: string, dropFirst?: boolean, dropLast?: boolean): Record<string, any>[];
export declare function walkJsonl(dir: string, depth: number, out: string[]): Promise<void>;
export declare function readJsonlRecords(path: string): AsyncGenerator<Record<string, any>>;
export declare function boundHistoryPayload(payload: Record<string, unknown>): Record<string, unknown>;
export declare class BoundedHistory<T> {
    #private;
    private readonly limit;
    constructor(limit: number);
    push(item: T): void;
    items(): T[];
    get total(): number;
    get offset(): number;
}
export declare function fitHistoryBytes<T extends {
    payload: Record<string, unknown>;
}>(events: T[], maxBytes: number): T[];
export declare function statJsonlFiles(paths: string[], statFn: (p: string) => Promise<{
    size: number;
    mtimeMs: number;
}>): Promise<Array<{
    path: string;
    mtimeMs: number;
    size: number;
}>>;