/**
 * @file GitHub API authentication header helpers.
 */
/**
 * Get GitHub authentication headers if token is available. Checks GH_TOKEN or
 * GITHUB_TOKEN environment variables.
 *
 * @example
 *   ;```typescript
 *   const headers = getAuthHeaders()
 *   // { Accept: 'application/vnd.github+json', Authorization: 'Bearer ...' }
 *   ```
 *
 * @returns Headers object with Authorization header if token exists.
 */
export declare function getAuthHeaders(): Record<string, string>;
