import type { Logger } from '../shared/index.js';
import type { MimeNodeEnvelope } from '../mime-node/index.js';
import type MailMessage from '../mailer/mail-message.js';
import type { default as Mail, SentMessageInfo, SendMailOptions, TransportOptions } from '../mailer/index.js';
/**
 * Options for the JSON transport
 */
export interface JSONTransportOptions extends TransportOptions {
    /** Selects this transport in createTransport */
    jsonTransport?: boolean | undefined;
    /** If true, the message is returned as an object instead of a JSON string */
    skipEncoding?: boolean | undefined;
}
/**
 * The value the JSON transport hands to the send callback. M is the type of the message
 * field: a JSON string by default, the message object itself when skipEncoding is set
 */
export interface JSONSentMessageInfo<M = string> extends SentMessageInfo {
    /** The envelope the message was generated with */
    envelope: MimeNodeEnvelope;
    /** Message-ID value of the message */
    messageId: string;
    /** The normalized message as a JSON string, or as the object itself when skipEncoding is set */
    message: M;
}
/**
 * The value the JSON transport hands to the send callback when skipEncoding is set: the
 * message field holds the message object. Typed loosely so that a transporter created with
 * skipEncoding still fits a variable declared with the plain result type
 */
export type JSONSentMessageObjectInfo = JSONSentMessageInfo<any>;
/**
 * Generates a Transport object to generate JSON output
 *
 * @constructor
 * @param optional config parameter
 */
declare class JSONTransport {
    mailer: Mail<JSONSentMessageInfo>;
    options: JSONTransportOptions;
    name: string;
    version: string;
    logger: Logger;
    constructor(options?: JSONTransportOptions);
    /**
     * <p>Compiles a mailcomposer message and forwards it to handler that sends it.</p>
     *
     * @param mail MailComposer object
     * @param done Callback function to run when the sending is completed
     */
    send(mail: MailMessage<JSONSentMessageInfo>, done: (err: Error | null, info?: JSONSentMessageInfo) => void): void;
}
/**
 * Type aliases in the layout of @types/nodemailer, so `JSONTransport.Options` style references keep working
 */
declare namespace JSONTransport {
    type Options = JSONTransportOptions;
    type MailOptions = SendMailOptions;
    type SentMessageInfo = JSONSentMessageInfo;
    type SentMessageObjectInfo = JSONSentMessageObjectInfo;
}
/** The same aliases as module level exports, for `import * as JSONTransport` and `import JSONTransport = require()` */
export type { JSONTransportOptions as Options, SendMailOptions as MailOptions, JSONSentMessageInfo as SentMessageInfo, JSONSentMessageObjectInfo as SentMessageObjectInfo };
export default JSONTransport;