import { ITableData } from '../../models/ITableData';
import { Observable } from 'rxjs';
export declare class CSVService {
    /**
     * Creates a sample csv with just the column the headers and prompts to download
     * @param anchor The <a> html element that serves as download button
     * @param filename The generated csv filename
     * @param cols Array with fields to use as headers
     */
    static exportCSV(anchor: HTMLAnchorElement, filename: string, cols: string[]): void;
    /**
     * Creates a sample csv with the suplied sample data and prompts to download
     * @param anchor The <a> html element that serves as download button
     * @param filename The generated csv filename
     * @param data Array with sample data as objects
     */
    static exportCSV(anchor: HTMLAnchorElement, filename: string, sample: {
        [header: string]: (string | number | boolean);
    }[]): void;
    /**
     * Parse a csv string and return an array of objects, taking the header row as keys
     * @param file CSV string to parse
     */
    /**
     * Parse a csv file and return an array of objects, taking the header row as keys
     * @param file CSV File to parse
     */
    static parseCSV(file: File): Observable<any[]>;
    /**
     * Parse a csv file and return an array of objects, taking the header row as keys
     * If step is present it emmits row by row, use for large files
     * @param file CSV File to parse
     * @param step Whether to parse whole file or row by row
     */
    static parseCSV(file: File, step: boolean): Observable<any>;
    /**
     * Transform papaparse data to key value pairs
     * @param data The data to transform. First row are the keys and the rest are the rows
     * @returns The transformed data
     */
    static transformData(data: any[]): ITableData[];
}