import * as nodeFs from 'node:fs';
export interface JsonlWriterOptions {
    dir: string;
    openSync?: typeof nodeFs.openSync;
    writeSync?: typeof nodeFs.writeSync;
    closeSync?: typeof nodeFs.closeSync;
    mkdirSync?: typeof nodeFs.mkdirSync;
    now?: () => Date;
}
export declare class JsonlWriter {
    private fd;
    private currentDate;
    private readonly dir;
    private readonly openSync;
    private readonly writeSync;
    private readonly closeSync;
    private readonly now;
    constructor(opts: JsonlWriterOptions);
    private filenameFor;
    writeLine(record: Record<string, unknown>): void;
    get currentPath(): string;
    close(): void;
}
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