/**
 * @module helper utility functions specific to encrypt-gib
 *
 * THANK YOU Stack Overflow, Simon Buchan, and others at https://stackoverflow.com/questions/21647928/javascript-unicode-string-to-hex
 */
/**
 * Convert some string to a string with only hex characters.
 *
 * Should (hopefully!) be reversible.
 *
 * @param s string to convert to hex string
 * @returns string that only contains hexidecimal characters (0-9, a-f)
 */
export declare function encodeStringToHexString(s: string): Promise<string>;
/**
 * Decodes the hex-encoded string back to the original text.
 *
 * @param hexString Encoded x of some some data string
 * @returns Decoded (original hopefully!) text
 */
export declare function decodeHexStringToString(hexString: string): Promise<string>;
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