/**
 * GitHub Webhook Handler
 *
 * Validates GitHub webhook signatures (HMAC-SHA256) and parses payloads
 * for issues, issue comments, discussions, and discussion comments.
 */
import type { WebhookResult } from './types.ts';
/**
 * Validate a GitHub webhook signature using HMAC-SHA256.
 *
 * @param rawBody - The raw request body string
 * @param signature - The X-Hub-Signature-256 header value
 * @param secret - The configured webhook secret
 * @returns true if the signature is valid
 */
export declare function validateSignature(rawBody: string, signature: string, secret: string): boolean;
/**
 * Parse a GitHub webhook payload and extract a triage-ready result.
 *
 * @param event - The X-GitHub-Event header value
 * @param payload - The parsed JSON payload
 * @returns A WebhookResult for triage, or null if the event should be ignored
 */
export declare function parsePayload(event: string, payload: Record<string, any>): WebhookResult | null;
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