/**
 * Whether `data` contains a reference into another document (a `$ref` value that
 * is not a same-document `#...` fragment). Same-document references resolve
 * without a disk round-trip, so callers can skip the file-backed resolver — and
 * preserve behavior that depends on those internal refs — unless an external
 * (cross-file or remote) target exists.
 */
export declare const hasExternalRefs: (data: unknown) => boolean;