import type { AnyObject } from '@naturalcycles/js-lib/types';
import type { TransformTyped } from '../stream/stream.model.js';
import type { CSVWriterConfig } from './csvWriter.js';
export interface TransformToCSVOptions extends CSVWriterConfig {
    /**
     * If true - will throw an error on stringify error
     *
     * @default true
     */
    strict?: boolean;
}
/**
 * Transforms objects (objectMode=true) into chunks \n-terminated CSV strings (readableObjectMode=false).
 */
export declare function transformToCSV<IN extends AnyObject = any>(opt: TransformToCSVOptions & {
    /**
     * Columns are required, as they cannot be detected on the fly.
     */
    columns: string[];
}): TransformTyped<IN, string>;