import { SceneAssetRefMap, SerializedSceneAssetDataMap } from '../../../../core/src/index.ts';
export interface FetchManifestAssetsOptions {
    headers?: HeadersInit;
    onProgress?: (fraction: number) => void;
}
/**
 * Fetches manifest asset refs in parallel into raw byte entries.
 * Progress is byte-weighted when all sizes are known, count-weighted otherwise.
 */
export declare function fetchManifestAssetData(assetRefs: SceneAssetRefMap, options?: FetchManifestAssetsOptions): Promise<SerializedSceneAssetDataMap>;