import { CallHandler, ExecutionContext, NestInterceptor } from "@nestjs/common";
import { Observable } from "rxjs";
import { GoogleAuthService } from "../services/google-auth.service";
/**
 * Interceptor that extracts a Google OAuth authorization code from the
 * `code` query parameter, exchanges it via {@link GoogleAuthService},
 * and attaches the result to `req.googleAuthResult`.
 *
 * Use the {@link GoogleCallback} decorator to apply this interceptor
 * to a controller method.
 *
 * @throws {GoogleCodeExchangeException} If the `code` query parameter is missing
 *
 * @example
 * ```typescript
 * @Get('callback')
 * @GoogleCallback()
 * public handleCallback(@GetGoogleAuthResult() result: GoogleAuthResult<User>): void {
 *   // result.entity, result.isNewUser, result.profile
 * }
 * ```
 */
export declare class GoogleCallbackInterceptor implements NestInterceptor {
    private readonly googleAuthService;
    constructor(googleAuthService: GoogleAuthService);
    intercept(context: ExecutionContext, next: CallHandler): Promise<Observable<any>>;
}