import { type CanActivateFn } from '@angular/router';
/**
 * Social redirect callback route guard.
 *
 * This guard supports the redirect-first social flow where the backend redirects
 * back to the frontend with:
 * - `appState` (always optional)
 * - `exchangeToken` (present for json/hybrid flows, and for cookie flows that return a challenge)
 * - `error` / `error_description` (provider errors)
 *
 * Behavior:
 * - If `exchangeToken` exists: exchanges it via backend (SDK handles navigation automatically).
 * - If no `exchangeToken`: treat as cookie-success path (SDK handles navigation automatically).
 * - If `error` exists: redirects to oauthError route.
 * - If auto-redirect is disabled (redirectUrls set to null): returns true to activate the route.
 *
 * @example
 * ```typescript
 * import { socialRedirectCallbackGuard } from '@nauth-toolkit/client/angular';
 *
 * export const routes: Routes = [
 *   { path: 'auth/callback', canActivate: [socialRedirectCallbackGuard], component: CallbackComponent },
 * ];
 * ```
 */
export declare const socialRedirectCallbackGuard: CanActivateFn;