/**
 * OAuth utility functions
 */
/**
 * Generates a secure random state for OAuth CSRF protection
 */
export declare function generateOAuthState(): string;
/**
 * Stores OAuth state securely for validation
 */
export declare function storeOAuthState(state: string): void;
/**
 * Retrieves stored OAuth state for validation
 */
export declare function getStoredOAuthState(): string | null;
/**
 * Clears stored OAuth state
 */
export declare function clearOAuthState(): void;
/**
 * Validates OAuth state to prevent CSRF attacks
 */
export declare function validateOAuthState(receivedState: string): boolean;
/**
 * Extracts OAuth callback parameters from URL
 */
export declare function extractOAuthParams(): {
    code: string | null;
    state: string | null;
    error: string | null;
};
/**
 * Checks if current URL is an OAuth callback
 */
export declare function isOAuthCallback(): boolean;
/**
 * Cleans OAuth parameters from URL
 */
export declare function cleanOAuthUrl(): void;