/**
 * This method leverages a native CSPRNG with support for both browser and Node.js
 * environments in order generate a cryptographically secure nonce for use in the
 * SiweMessage in order to prevent replay attacks.
 *
 * 96 bits has been chosen as a number to sufficiently balance size and security considerations
 * relative to the lifespan of it's usage.
 *
 * @returns cryptographically generated random nonce with 96 bits of entropy encoded with
 * an alphanumeric character set.
 */
export declare const generateNonce: () => string;
/**
 * This method matches the given date string against the ISO-8601 regex and also
 * performs checks if it's a valid date.
 * @param inputDate any string to be validated against ISO-8601
 * @returns boolean indicating if the providade date is valid and conformant to ISO-8601
 */
export declare const isValidISO8601Date: (inputDate: string) => boolean;
export declare const checkInvalidKeys: <T>(obj: T, keys: (keyof T)[]) => (keyof T)[];
/**
 * This method is supposed to check if an address is conforming to EIP-55.
 * @param address Address to be checked if conforms with EIP-55.
 * @returns Either the return is or not in the EIP-55 format.
 */
export declare const isEIP55Address: (address: string) => boolean;
export declare const parseIntegerNumber: (number: string) => number;