/**
 * Webhook emitter — sends vault events to external HTTP endpoints.
 *
 * Features:
 *   - Fire-and-forget (non-blocking, catches errors)
 *   - Optional HMAC-SHA256 signature header (X-Vault-Signature)
 *   - Configurable timeout
 *   - One retry with 2s delay on failure
 *   - Multiple URLs (comma-separated)
 */
import type { VaultEvent } from "./events.js";
export interface WebhookConfig {
    /** Comma-separated webhook URLs */
    urls: string[];
    /** HMAC signing secret (optional) */
    secret?: string;
    /** HTTP timeout in ms */
    timeoutMs: number;
}
export declare class WebhookEmitter {
    private config;
    constructor(config: WebhookConfig);
    /**
     * Send event to all configured webhook URLs.
     * Fire-and-forget — errors are logged but never thrown.
     */
    send(event: VaultEvent): Promise<void>;
    private sendToUrl;
}
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