/** What the panel knows about an asset, reduced to what there is to draw. */
export type AssetViewerKind = 'glb' | 'vxl';
export interface AssetViewerOptions {
    /** The element to fill. Sized by CSS; the viewer follows it. */
    container: HTMLElement;
    /** The GLB or VXL to show. For `vxl` this is fetched through the sidecar, not directly. */
    url: string;
    kind: AssetViewerKind;
    /** Where to fetch bytes from, so the caller can point this at its own origin. */
    sourceEndpoint: string;
}
export interface AssetViewerHandle {
    /** Back to the angle the thumbnail was rendered at. */
    resetView(): void;
    /** Triangles in the loaded object — the one number that says "this is a heavy asset". */
    readonly triangles: number;
    dispose(): void;
}
export declare function startAssetViewer(options: AssetViewerOptions): Promise<AssetViewerHandle>;