import { LinkedInSignInCredentials, LinkedInUserRetrievedData } from '../types';
/**
 * Class to handle LinkedIn OAuth authentication.
 * Provides methods to exchange authorization codes for tokens,
 * decode ID tokens, and validate user credentials.
 */
export declare class LinkedInAuthHandler {
    private readonly credentials;
    /**
     * Constructor to initialize the LinkedInAuthHandler with the necessary credentials.
     * @param {LinkedInSignInCredentials} credentials - Credentials object containing clientId, clientSecret, and redirectURI.
     */
    constructor(credentials: LinkedInSignInCredentials);
    /**
     * Exchanges the authorization code for LinkedIn tokens (access token, ID token).
     * @param {string} authorizationCode - The authorization code received from LinkedIn during OAuth flow.
     * @returns {Promise<LinkedInUserCodeExchangedData>} - Returns a promise that resolves to the token exchange data.
     * @throws {LinkedInAuthError} - Throws an error if the exchange process fails.
     */
    private exchangeAuthorizationCode;
    /**
     * Decodes and validates the given ID token using LinkedIn's public key.
     * @param {string} idToken - ID token received from LinkedIn.
     * @returns {Promise<any>} The decoded token payload.
     */
    private static decodeIdToken;
    /**
     * Decodes and verifies the provided ID token, extracting user information.
     * @param {LinkedInUserCodeExchangedData} codeExchangeData - The exchanged code containing the ID token to be decoded.
     * @returns {Promise<LinkedInUserRetrievedData>} The decoded user data.
     * @throws {LinkedInAuthError} - Throws an error if token validation fails.
     */
    private retrieveUserInfo;
    /**
     * Validates user credentials by exchanging an authorization code and decoding the ID token.
     * @param {object} param0 - Object containing the authorization code.
     * @param {string} param0.authorizationCode - The authorization code to be exchanged.
     * @returns {Promise<LinkedInUserRetrievedData>} The validated and decoded user data.
     * @throws {LinkedInAuthError} - Throws an error if credential validation fails.
     */
    validateUserCredentials({ authorizationCode }: {
        authorizationCode: string;
    }): Promise<LinkedInUserRetrievedData>;
    /**
     * Validates the issuer of the ID token.
     * @param {string | undefined} issuer - The issuer to be validated.
     * @returns {boolean} True if the issuer is valid; otherwise, false.
     */
    private isIssuerValid;
}