/**
 * Module representing the `TokensData` class, which manages a dictionary of tokens and allows
 * adding, removing, and retrieving tokens, as well as setting a default token.
 *
 * @module tokens-data
 */
import { TokensData as ITokensData } from '../types/transport.types';
/**
 * Class representing a dictionary of tokens with a default token ID.
 */
export declare class TokensData implements ITokensData {
    private tokens;
    private defaultId;
    constructor(tokens?: {
        [key: string]: string;
    }, defaultId?: string);
    /**
     * Adds a new token to the tokens dictionary.
     *
     * @param {string} tokenId - The unique identifier of the token.
     * @param {string} token - The token value.
     * @return {boolean} True if the token was added successfully, false if the token already exists.
     */
    addToken(tokenId: string, token: string): boolean;
    /**
     * Removes a token from the tokens dictionary and updates the default token if necessary.
     *
     * @param {string} tokenId - The unique identifier of the token to remove.
     * @param {string} [defaultId] - The new default token ID. If not provided, the first remaining token will be used.
     * @return {boolean} True if the token was removed successfully, false if the token does not exist or the default ID is invalid.
     */
    removeToken(tokenId: string, defaultId?: string): boolean;
    /**
     * Retrieves a token from the tokens dictionary by its unique identifier.
     *
     * @param {string} tokenId - The unique identifier of the token to retrieve.
     * @return {string | undefined} The token value if found, or undefined if not found.
     */
    getToken(tokenId: string): string | undefined;
    /**
     * Sets the default token ID.
     *
     * @param {string} tokenId - The ID of the token to set as default.
     * @return {boolean} True if the default token was set successfully, false if the token does not exist.
     */
    setDefaultToken(tokenId: string): boolean;
    /**
     * Retrieves the default token from the tokens dictionary.
     *
     * @return {string | undefined} The default token value if found, or undefined if not found.
     */
    getDefaultToken(): string | undefined;
}