/******************************************************************************
 *
 *  (C) 2022 AhnLab Blockchain Company, Inc. All rights reserved.
 *  Any part of this source code can not be copied with any method without
 *  prior written permission from the author or authorized person.
 *
 ******************************************************************************/
export declare const ascii_to_hexa: (str: any) => string;
export declare const padWithZeroes: (number: string, length: number) => string;
export declare const addHexPrefix: (str: any) => any;
/**
 * Validates that the input is a hex address. This utility method is a thin
 * wrapper around ethereumjs-util.isValidAddress, with the exception that it
 * does not throw an error when provided values that are not hex strings. In
 * addition, and by default, this method will return true for hex strings that
 * meet the length requirement of a hex address, but are not prefixed with `0x`
 * Finally, if the mixedCaseUseChecksum flag is true and a mixed case string is
 * provided this method will validate it has the proper checksum formatting.
 * @param {string} possibleAddress - Input parameter to check against
 * @param {Object} [options] - options bag
 * @param {boolean} [options.allowNonPrefixed] - If true will first ensure '0x'
 *  is prepended to the string
 * @param {boolean} [options.mixedCaseUseChecksum] - If true will treat mixed
 *  case addresses as checksum addresses and validate that proper checksum
 *  format is used
 * @returns {boolean} whether or not the input is a valid hex address
 */
export declare const isValidHexAddress: (possibleAddress: any, { allowNonPrefixed, mixedCaseUseChecksum }?: {
    allowNonPrefixed?: boolean;
    mixedCaseUseChecksum?: boolean;
}) => boolean;
export declare const trimUrl: (url: string) => string;
export declare const isValidURL: (string: string) => boolean;