/**
 * Validates if a Brazilian bank slip (boleto) number is valid.
 *
 * @param {string} value - The bank slip number to validate.
 * @returns {boolean} True if the bank slip number is valid, false otherwise.
 *
 * @example
 * ```typescript
 * isValidBoleto("00190000090114971860168524522114675860000102656"); // true
 * isValidBoleto("0019000009 01149.718601 68524.522114 6 75860000102656"); // true
 * ```
 */
export declare const isValidBoleto: (value: string) => boolean;