import { Logger, LoggerService, OnModuleInit } from '@nestjs/common';
import type { EmailLogTransportService } from './email-log-transport.service';
import type { EmailLogOptions } from '../interfaces';
/**
 * Enhanced Logger service with email alert support
 * This service wraps the standard NestJS Logger and adds email alert functionality
 * for error and fatal level logs.
 *
 * @example
 * ```typescript
 * import { EmailLogLogger } from '@nest-omni/core';
 *
 * @Injectable()
 * export class MyService {
 *   private readonly logger = new EmailLogLogger(MyService.name);
 *
 *   handleError() {
 *     this.logger.error('Something went wrong!', error.stack);
 *     // This will both log to console and send an email alert
 *   }
 * }
 * ```
 */
export declare class EmailLogLogger extends Logger implements LoggerService, OnModuleInit {
    private emailTransportService?;
    private emailTransport?;
    private emailOptions?;
    private minLevel;
    constructor(context?: string, emailTransportService?: EmailLogTransportService);
    /**
     * Initialize with email transport from DI
     */
    onModuleInit(): Promise<void>;
    /**
     * Set email transport manually (alternative to DI)
     */
    setEmailTransport(transport: EmailLogTransportService, options: EmailLogOptions): void;
    /**
     * Log message
     */
    log(message: any, context?: string): void;
    /**
     * Log error message
     */
    error(message: any, stack?: string, context?: string): void;
    /**
     * Log warn message
     */
    warn(message: any, context?: string): void;
    /**
     * Log debug message
     */
    debug(message: any, context?: string): void;
    /**
     * Log verbose message
     */
    verbose(message: any, context?: string): void;
    /**
     * Log fatal error message
     */
    fatal(message: any, stack?: string, context?: string): void;
    /**
     * Send email alert if needed based on log level
     */
    private sendEmailIfNeeded;
    /**
     * Check if email should be sent for the given log level
     */
    private shouldSendEmail;
}
/**
 * Factory function to create an EmailLogLogger with email transport
 * Use this in your services to get a logger with email alert support
 *
 * @example
 * ```typescript
 * import { createEmailLogger } from '@nest-omni/core';
 *
 * @Injectable()
 * export class MyService {
 *   private readonly logger = createEmailLogger(MyService.name);
 * }
 * ```
 */
export declare function createEmailLogger(context: string, emailTransport?: EmailLogTransportService, options?: EmailLogOptions): EmailLogLogger;