import { ConfigService } from '@nestjs/config';
import { INotification } from '../interfaces';
import { INotificationTransport } from './interfaces';
export declare class AppSyncService implements INotificationTransport {
    private readonly config;
    private readonly logger;
    private readonly endpoint;
    private readonly hostname;
    private readonly apiKey;
    private readonly region;
    private readonly signer;
    constructor(config: ConfigService);
    sendMessage(notification: INotification): Promise<void>;
}