export type AuthSource = "GH_TOKEN" | "GITHUB_TOKEN" | "gh auth token" | "GITHUB_PERSONAL_ACCESS_TOKEN";
export declare function _resetTokenCache(): void;
export declare function hasCachedToken(): boolean;
export declare function clearTokenCache(): void;
/**
 * `extra` lets callers layer additional headers (e.g. `If-None-Match` for
 * conditional REST requests) on top of the standard auth/version headers.
 */
export declare function makeAuthHeaders(extra?: Record<string, string>): Promise<{
    headers: Record<string, string>;
    source: AuthSource;
}>;