/**
 * OpenKernel — Slack Plugin (Stub)
 *
 * Notifications via Slack webhook. Requires SLACK_WEBHOOK_URL.
 */
import type { KernelEventType, Plugin } from '../types.js';
export interface SlackPluginOptions {
    webhookUrl?: string;
    notifyOn?: KernelEventType[];
}
export declare function createSlackPlugin(options: SlackPluginOptions): Plugin;