import { SentlyError } from "../core/errors.js";
import type { MailOptions, SendResult, Transport, VerifyResult } from "../core/types.js";
/** Resend API configuration. */
export interface ResendConfig {
    /** Resend API key (starts with `re_`). */
    apiKey: string;
    /** API base URL. Default: `https://api.resend.com`. */
    baseUrl?: string;
    /** Max batch HTTP requests per rate window. Default: `2` (Resend API limit). Set `0` to disable. */
    rateDelta?: number;
    /** Rate limit window in milliseconds. Default: `1000`. */
    rateLimit?: number;
}
/** Maximum messages per Resend batch request (overridable per account). */
export declare const RESEND_BATCH_MAX = 100;
/** Error thrown when the Resend API returns a non-success response. */
export declare class ResendError extends SentlyError {
    readonly statusCode: number;
    readonly apiError: unknown;
    /** Creates a Resend API error with status code and response payload. */
    constructor(message: string, statusCode: number, apiError: unknown);
}
/**
 * Resend HTTP API transport.
 */
export declare class ResendTransport implements Transport {
    readonly provider = "resend";
    /** Resend API key for Bearer authentication. */
    private readonly apiKey;
    /** Resend API base URL. */
    private readonly baseUrl;
    /** Optional rate limiter for multi-chunk batch sends. */
    private readonly rateLimiter;
    /** Maximum messages per batch HTTP request. */
    readonly batchMax = 100;
    /** Creates a Resend transport with the given API key. */
    constructor(config: ResendConfig);
    /** Build the JSON body for a single Resend email. */
    private buildEmailBody;
    /** Map a Resend API response id to a normalized SendResult. */
    private toSendResult;
    /** Sends an email via the Resend HTTP API. */
    send(options: MailOptions): Promise<SendResult>;
    /** Send up to {@link RESEND_BATCH_MAX} attachment-free messages per batch request. */
    sendBatch(messages: MailOptions[]): Promise<SendResult[]>;
    /** Verifies the Resend API key by listing domains. */
    verify(): Promise<VerifyResult>;
}