import { Snapshot } from './contract';
export type Logger = (msg: string) => void;
export declare class Store {
    private capBytes;
    private log;
    readonly rawDir: string;
    readonly rollupDir: string;
    private chain;
    private currentHourKey;
    private knownKeys;
    private bytes;
    onHourClosed: ((closedHour: string) => Promise<void>) | null;
    constructor(dataDir: string, capBytes: number, log: Logger);
    init(now: number): Promise<void>;
    private enqueue;
    rawPath(hour: string): string;
    append(snap: Snapshot): Promise<void>;
    listRawKeys(): Promise<string[]>;
    readRaw(hour: string): Promise<Snapshot[]>;
    rawUsage(): Promise<{
        bytes: number;
        files: number;
        oldest: string | null;
    }>;
    enforceCap(): Promise<number>;
    flush(): Promise<void>;
}
export declare function parseNdjson<T>(text: string): T[];