import { ConfigService } from '@nestjs/config';
import { Job, Queue } from 'bull';
import { TemplateService } from '../template';
import { MailAdapter } from './adapters';
import { MailModuleOptions } from './mail.module';
import { SendMailData } from './mail.job';
export type MailContent = {
    text?: string;
    html?: string;
    template?: {
        name?: string;
        content?: string;
        context?: Record<string, any>;
    };
};
export type MailAttachment = {
    filename: string;
    path?: string;
    content?: string;
};
export declare class MailService {
    private mailAdapter;
    private mailModuleOptions;
    private mailQueue;
    private templateService;
    private configService;
    private readonly logger;
    private readonly queueEnabled;
    private readonly templateEnabled;
    constructor(mailAdapter: MailAdapter, mailModuleOptions: MailModuleOptions, mailQueue: Queue<SendMailData>, templateService: TemplateService, configService: ConfigService);
    send(to: string, subject: string, content: MailContent, attachments?: MailAttachment[]): Promise<boolean>;
    sendToQueue(to: string, subject: string, content: MailContent, attachments?: MailAttachment[]): Promise<Job<SendMailData>>;
    sendDirect(to: string, subject: string, content: MailContent, attachments?: MailAttachment[]): Promise<boolean>;
    compileContent(content: MailContent): Promise<{
        text: string;
        html: string;
    }>;
    checkConnection(): Promise<{
        status: boolean;
        message?: string;
    }>;
}