import { SentlyError } from "../core/errors.js";
import type { MailOptions, SendResult, Transport, VerifyResult } from "../core/types.js";
/** Loops HTTP API configuration. */
export interface LoopsConfig {
    /** Loops API key for Bearer authentication. */
    apiKey: string;
    /** Default transactional template ID when not set per message via header. */
    defaultTransactionalId?: string;
}
/** Error thrown when the Loops API returns a non-success response. */
export declare class LoopsError extends SentlyError {
    readonly statusCode: number;
    readonly apiError: unknown;
    /** Creates a Loops API error with status code. */
    constructor(message: string, statusCode: number, apiError: unknown);
}
/**
 * Loops transactional HTTP API transport.
 */
export declare class LoopsTransport implements Transport {
    readonly provider = "loops";
    private readonly apiKey;
    private readonly defaultTransactionalId?;
    /** Creates a Loops transport with the given API key. */
    constructor(config: LoopsConfig);
    /** Sends a transactional email via the Loops HTTP API. */
    send(options: MailOptions): Promise<SendResult>;
    /**
     * Returns success without a network call — Loops has no simple verify endpoint.
     */
    verify(): Promise<VerifyResult>;
}