/**
 * Validates that a QR string is non-empty and follows the TLV format.
 *
 * This function checks two things:
 * 1. The string must not be empty or whitespace.
 * 2. It must follow a pattern consistent with EMVCo TLV encoding
 *    (e.g., `ID + LENGTH + VALUE`).
 *
 * Throws meaningful errors if the input fails these validations.
 *
 * @param rawQRString - The QR string to validate.
 * @throws {Error} If the QR string is empty or not TLV-compliant.
 */
export declare function validateQRString(rawQRString: string): void;