/**
* Returns a `Boolean` on whether or not the a `String` starts with '0x'
* @param str the string input value
* @return a boolean if it is or is not hex prefixed
* @throws if the str input is not a string
*/
export declare function isHexPrefixed(str: string): boolean;
/**
* Removes '0x' from a given `String` if present
* @param str the string value
* @returns the string without 0x prefix
*/
export declare const stripHexPrefix: (str: string) => string;
/**
* Pads a `String` to have an even length
* @param value
* @return output
*/
export declare function padToEven(value: string): string;
/**
* Get the binary size of a string
* @param str
* @returns the number of bytes contained within the string
*/
export declare function getBinarySize(str: string): number;
/**
* Returns TRUE if the first specified array contains all elements
* from the second one. FALSE otherwise.
*
* @param superset
* @param subset
*
*/
export declare function arrayContainsArray(superset: unknown[], subset: unknown[], some?: boolean): boolean;
/**
* Should be called to get ascii from its hex representation
*
* @param string in hex
* @returns ascii string representation of hex value
*/
export declare function toAscii(hex: string): string;
/**
* Should be called to get hex representation (prefixed by 0x) of utf8 string
*
* @param string
* @param optional padding
* @returns hex representation of input string
*/
export declare function fromUtf8(stringValue: string): string;
/**
* Should be called to get hex representation (prefixed by 0x) of ascii string
*
* @param string
* @param optional padding
* @returns hex representation of input string
*/
export declare function fromAscii(stringValue: string): string;
/**
* Returns the keys from an array of objects.
* @example
* ```js
* getKeys([{a: '1', b: '2'}, {a: '3', b: '4'}], 'a') => ['1', '3']
*````
* @param params
* @param key
* @param allowEmpty
* @returns output just a simple array of output keys
*/
export declare function getKeys(params: Record<string, string>[], key: string, allowEmpty?: boolean): string[];
/**
* Is the string a hex string.
*
* @param value
* @param length
* @returns output the string is a hex string
*/
export declare function isHexString(value: string, length?: number): boolean;
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