import { MailDataRequired, MailService, ResponseError } from "@sendgrid/mail";
import { SendGridModuleOptions } from "./sendgrid.interfaces";
type Response = Awaited<ReturnType<MailService["send"]>>;
export declare class SendGridService {
    private readonly options;
    private readonly mailService;
    constructor(options: SendGridModuleOptions, mailService: MailService);
    send(data: Partial<MailDataRequired> | Partial<MailDataRequired>[], isMultiple?: boolean, cb?: (err: Error | ResponseError, result: Response) => void): Promise<Response>;
    sendMultiple(data: Partial<MailDataRequired>, cb?: (error: Error | ResponseError, result: Response) => void): Promise<Response>;
    private mergeWithDefaultMailData;
}
export {};