import { SentlyError } from "../core/errors.js";
import type { MailOptions, SendResult, Transport, VerifyResult } from "../core/types.js";
/** SparkPost HTTP API configuration. */
export interface SparkPostConfig {
    /** SparkPost API key (raw key — no Bearer prefix). */
    apiKey: string;
    /** When true, use the EU API host (`api.eu.sparkpost.com`). */
    euRegion?: boolean;
}
/** Error thrown when the SparkPost API returns a non-success response. */
export declare class SparkPostError extends SentlyError {
    readonly statusCode: number;
    readonly errors: unknown;
    /** Creates a SparkPost API error with status code and error details. */
    constructor(message: string, statusCode: number, errors: unknown);
}
/**
 * SparkPost HTTP API transport.
 */
export declare class SparkPostTransport implements Transport {
    readonly provider = "sparkpost";
    private readonly apiKey;
    private readonly baseUrl;
    /** Creates a SparkPost transport with the given API key. */
    constructor(config: SparkPostConfig);
    /** Sends an email via the SparkPost transmissions API. */
    send(options: MailOptions): Promise<SendResult>;
    /** Verifies the SparkPost API key by fetching account info. */
    verify(): Promise<VerifyResult>;
}