/**
 * Represents a salt value used in hashing.
 */
export type HashSalt = string;
/**
 * A Map used for decoding hashed string values.
 *
 * @template H The type of the hashed string (key).
 * @template V The type of the original string (value).
 */
export type HashDecodeMap<H extends string = string, V extends string = string> = Map<H, V>;
/**
 * Decodes a list of hashed string values using a provided list of potential original values and a hash function.
 *
 * @param hashedValues - An array of hashed strings to decode.
 * @param decodeValues - An array of potential original string values.
 * @param hashFn - A function that takes a string and returns its hashed representation.
 * @returns An array of decoded strings. Values that cannot be decoded are filtered out.
 *
 * @example
 * ```ts
 * const hashed = [hashFn('apple'), hashFn('banana')];
 * decodeHashedValues(hashed, ['apple', 'banana', 'cherry'], hashFn);
 * // ['apple', 'banana']
 * ```
 */
export declare function decodeHashedValues(hashedValues: string[], decodeValues: string[], hashFn: (value: string) => string): string[];
/**
 * Creates a `HashDecodeMap` from a list of potential original string values and a hash function.
 * The map's keys are the hashed versions of the `decodeValues`, and the values are the original `decodeValues`.
 *
 * @param decodeValues - An array of potential original string values.
 * @param hashFn - A function that takes a string and returns its hashed representation.
 * @returns A {@link HashDecodeMap} for decoding hashed values.
 */
export declare function makeHashDecodeMap(decodeValues: string[], hashFn: (value: string) => string): HashDecodeMap;
/**
 * Decodes a list of hashed string values using a pre-built `HashDecodeMap`.
 *
 * @param hashedValues - An array of hashed strings to decode.
 * @param decodeMap - A {@link HashDecodeMap} to use for looking up original values.
 * @returns An array of decoded strings. Values that cannot be decoded are filtered out.
 */
export declare function decodeHashedValuesWithDecodeMap(hashedValues: string[], decodeMap: HashDecodeMap): string[];