import { DownloadOptions } from './models';
export declare const cache: Map<any, any>;
/**
 * Extract signature deciphering tokens from html5player file.
 *
 * @param {string} html5playerfile
 * @param {Object} options
 * @param {Function(!Error, Array.<string>)} callback
 */
export declare const getTokens: (html5playerfile: string, options: DownloadOptions) => Promise<any>;
/**
 * Decipher a signature based on action tokens.
 *
 * @param {Array.<string>} tokens
 * @param {string} sig
 * @return {string}
 */
export declare const decipher: (tokens: any, sig: any) => any;
/**
 * Extracts the actions that should be taken to decipher a signature.
 *
 * This searches for a function that performs string manipulations on
 * the signature. We already know what the 3 possible changes to a signature
 * are in order to decipher it. There is
 *
 * * Reversing the string.
 * * Removing a number of characters from the beginning.
 * * Swapping the first character with another position.
 *
 * Note, `Array#slice()` used to be used instead of `Array#splice()`,
 * it's kept in case we encounter any older html5player files.
 *
 * After retrieving the function that does this, we can see what actions
 * it takes on a signature.
 *
 * @param {string} body
 * @return {Array.<string>}
 */
export declare const extractActions: (body: any) => any[];
/**
 * @param {Object} format
 * @param {string} sig
 * @param {boolean} debug
 */
export declare const setDownloadURL: (format: any, sig: any, debug: any) => void;
/**
 * Applies `sig.decipher()` to all format URL's.
 *
 * @param {Array.<Object>} formats
 * @param {Array.<string>} tokens
 * @param {boolean} debug
 */
export declare const decipherFormats: (formats: any, tokens: any, debug: any) => void;