export interface VxlSummary {
    version: number;
    minVoxelSize: number;
    boundingBox: {
        minX: number;
        minY: number;
        minZ: number;
        maxX: number;
        maxY: number;
        maxZ: number;
    };
    fragmentCount: number;
    /** Absent when the fragment table could not be walked to its end. */
    voxelCount?: number;
}
/** True when the first four bytes are the VXL3 magic — cheap, no copy, no decompression. */
export declare function isVxl3(bytes: Uint8Array): boolean;
/**
 * Read a VXL3 file's header. Returns `null` for anything that is not a well-formed VXL3 — a legacy
 * JSON `.vxl`, a truncated file, an unknown compression id — so the caller can name the problem
 * instead of writing an asset entry the engine would then fail to load.
 */
export declare function summarizeVxl(bytes: Uint8Array): VxlSummary | null;
/**
 * True when these bytes really are a binary GLB.
 *
 * Checked before `assets add` uploads a `.glb` and spends a minute launching a browser: a `.gltf`
 * renamed, a truncated download or a Git-LFS pointer otherwise sails through classification and
 * fails inside the engine, with the bytes already in storage and no way to delete them. The `.vxl`
 * lane has always had this via `isVxl3`; this is the same guard for the other binary kind.
 */
export declare function isGlb(bytes: Uint8Array): boolean;