/**
 * CSRF Token Manager for OAuth flows
 *
 * Manages CSRF protection tokens that prevent cross-site request forgery
 * during OAuth authorization flows. Tokens are stored in Harper table
 * for distributed access across workers and cluster nodes.
 */
import type { CSRFTokenData, Logger } from '../types.ts';
/**
 * Reset the cached CSRF table reference (for testing only)
 * @internal
 */
export declare function resetCSRFTableCache(): void;
export declare class CSRFTokenManager {
    private logger?;
    constructor(logger?: Logger);
    /**
     * Store CSRF token with metadata
     * Table expiration is handled by Harper (10 minutes)
     */
    set(token: string, data: CSRFTokenData): Promise<void>;
    /**
     * Retrieve CSRF token
     * Harper automatically handles expiration via table-level setting
     */
    get(token: string): Promise<CSRFTokenData | null>;
    /**
     * Delete CSRF token (after successful verification)
     */
    delete(token: string): Promise<void>;
}
export declare const csrfTokenManager: CSRFTokenManager;