export type ConcurrencyOption = number | undefined;
export interface ParallelizeOptions {
    concurrency?: ConcurrencyOption;
    csvThresholdBytes?: number;
    jsonRowThreshold?: number;
}
export declare function splitCsvIntoChunks(csv: string, chunkCount: number, hasHeaders: boolean): string[];
export declare function planConcurrency(inputSize: number, itemKind: 'csvBytes' | 'jsonRows', opts: ParallelizeOptions): number;
export declare function parallelCsvToJson<R = unknown[]>(csv: string, options: Record<string, unknown> | undefined, parallelOpts: ParallelizeOptions, syncFn: (csv: string, options?: Record<string, unknown>) => R): Promise<R>;
export declare function parallelJsonToCsv<R = string>(data: unknown[], options: Record<string, unknown> | undefined, parallelOpts: ParallelizeOptions, syncFn: (data: unknown[], options?: Record<string, unknown>) => R): Promise<R>;