import { DBDockConfigService } from '../config/config.service';
import { AlertType, AlertTemplate } from './alert.types';
import { BackupMetadata } from '../backup/backup.types';
export declare class AlertService {
    private configService;
    private readonly logger;
    private transporter;
    private customTemplates;
    constructor(configService: DBDockConfigService);
    private initializeTransporter;
    setCustomTemplate(type: AlertType, template: AlertTemplate): void;
    sendBackupSuccessAlert(metadata: BackupMetadata, downloadUrl?: string): Promise<void>;
    sendBackupFailureAlert(metadata: BackupMetadata, error: Error): Promise<void>;
    sendRetentionCleanupAlert(details: {
        backupsDeleted: number;
        walFilesDeleted: number;
        spaceFreed: number;
    }): Promise<void>;
    sendStorageErrorAlert(error: Error): Promise<void>;
    private sendAlert;
    private sendEmail;
    verifyConnection(): Promise<boolean>;
}