/**
 * escape a string to put inside a csv cell, adds quotes around it only
 * when necessary
 */
export declare function csvEscape(str: string): string;
/**
 * encode a full line of csv with properly escaped strings, adds an
 * appropriate line break at the end
 */
export declare function csvLine(values: string[]): string;
/**
 * encode a full csv file with proper line breaks and escaped strings
 */
export declare function csv(lines: string[][]): string;