/** A digit in a EAN8/EAN13 string */
export type Digit = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9;
/** Encode an EAN8/EAN13 with potential 2-digits or 5-digits extensions */
export declare function ean(string: string): string;
export declare function checksum(string: string): Digit;