export interface SilentLoginOptions {
    /**
     * The URL to navigate the iframe to for silent login.
     * Defaults to `${baseURL}/bff/silent-login`.
     */
    authURL?: string;
    /**
     * The base URL of the microservice BFF.
     * Used to construct the default authURL.
     */
    baseURL?: string;
    /**
     * The URL to fetch auth info from before initiating silent login.
     * Defaults to `/bff/authInfo`.
     */
    authInfoURL?: string;
    /**
     * Timeout in milliseconds for the silent login iframe to respond.
     * Defaults to 60000 (1 minute).
     */
    timeout?: number;
    /**
     * An AbortSignal to cancel the silent login.
     */
    signal?: AbortSignal;
}
export declare class TokenServerAuthError extends Error {
    data: any;
    constructor(message: string, data: any);
}
/**
 * Performs a silent login using a hidden iframe and postMessage protocol.
 *
 * 1. Fetches auth info from the authInfoURL endpoint
 * 2. Creates a hidden iframe pointed at the silent login URL
 * 3. Waits for a postMessage response from the iframe
 * 4. Resolves on success, rejects with TokenServerAuthError on failure
 *
 * This function has no React, axios, or other framework dependencies.
 */
export declare function silentLogin(options?: SilentLoginOptions): Promise<void>;
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