/**
 * Parameter decorator that extracts the Google OAuth authentication result
 * from the request object.
 *
 * Must be used on routes decorated with {@link GoogleCallback}, which
 * attaches `googleAuthResult` to the request via the
 * {@link GoogleCallbackInterceptor}.
 *
 * @throws {Error} If `req.googleAuthResult` is missing, indicating
 *   `@GoogleCallback()` was not applied to the route
 *
 * @example
 * ```typescript
 * @Get('callback')
 * @GoogleCallback()
 * public handleCallback(
 *   @GetGoogleAuthResult() result: GoogleAuthResult<User>,
 * ): void {
 *   // result.entity, result.isNewUser, result.profile
 * }
 * ```
 */
export declare const GetGoogleAuthResult: (...dataOrPipes: any[]) => ParameterDecorator;