import type { MessageInterface } from './types.js';
/**
 * High-level API for sending messages to Slack via webhooks.
 */
export declare class SlackFacade {
    private webhookUrl;
    constructor(webhookUrl: string);
    /**
     * Serialize and send a Message object to the Slack webhook.
     */
    sendMessage(message: MessageInterface): Promise<string>;
    /**
     * Send a raw JSON string to the Slack webhook.
     */
    send(jsonBody: string): Promise<string>;
}
export declare class NetworkCallError extends Error {
    constructor(message: string);
}
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