import { BaseConnector } from '../../base/base.connector';
import type { IEmailOptions, IEmailProvider, ISendMessageSuccessResponse, WithPassthrough, EmailSendInput, EmailSendResult, IEmailConnector } from '../../types';
import { ChannelTypeEnum } from '../../types';
import type { MailgunConfig } from './mailgun.config';
export declare class MailgunEmailConnector extends BaseConnector implements IEmailProvider, IEmailConnector {
    private config;
    readonly id = "mailgun";
    readonly channelType: ChannelTypeEnum.EMAIL;
    constructor(config: MailgunConfig, fetchImpl?: typeof fetch);
    /**
     * Thinwrap-native send. Implements `IEmailConnector`.
     * Builds either an `application/x-www-form-urlencoded` body (no attachments)
     * or a `multipart/form-data` body (with attachments), authenticates with
     * HTTP Basic (`api:<apiKey>`), and POSTs to
     * `https://api.mailgun.net/v3/<domain>/messages` (or the EU equivalent when
     * `region: 'eu'`). Returns `status: 'queued'` — Mailgun's response
     * is queue acceptance, not delivery confirmation.
     */
    send(input: EmailSendInput): Promise<EmailSendResult>;
    /**
     * Build the Mailgun form-field record from Thinwrap's `EmailSendInput`.
     * Mailgun's wire keys are hand-mapped (locality): `replyTo` →
     * `h:Reply-To`, custom `headers` → `h:<Name>`. `o:tag` is appended later as
     * a repeated key (URLSearchParams handles repetition; a plain `Record` does
     * not, so tags are handled at serialization time).
     */
    private buildMailgunFields;
    /**
     * Resolve `/v3/<domain>/messages`. The Basic credentials go to this URL, so
     * a `baseUrl` override must be https — Mailgun's own hosts
     * (`api.mailgun.net`, `api.eu.mailgun.net`) are https-only.
     */
    private messagesUrl;
    /**
     * Map Mailgun error responses to canonical `ConnectorError` with the
     * 6-value `ProviderCode` union. Parses `Retry-After`:
     * parsed seconds embedded in `providerMessage` text;
     * raw header value on `cause.retryAfter`. No structured `retryAfterSeconds`
     * field — retry is consumer policy.
     */
    private mapVendorError;
    sendMessage(options: IEmailOptions, bridgeProviderData?: WithPassthrough<Record<string, unknown>>): Promise<ISendMessageSuccessResponse>;
    /**
     * Build a `multipart/form-data` body from Thinwrap's `EmailAttachment[]`
     * . Each attachment becomes a `name="attachment"` part (or
     * `name="inline"` when `contentId` is set, per Mailgun's cid pattern).
     */
    private buildMultipartBody;
    /**
     * Multipart builder for the Novu-compatible `sendMessage()` surface.
     * Consumes Novu's `IAttachmentOptions` shape (`name`/`mime`/`file`) — kept
     * separate from `buildMultipartBody()` so the new Thinwrap surface speaks
     * the post attachment shape exclusively.
     */
    private buildMultipartBodyLegacy;
}