import { BufferAttribute, BufferGeometry } from 'three';
export declare class BufferGeometryUtils {
    /**
     * @param  {Array<BufferGeometry>} geometries
     * @param  {Boolean} useGroups
     * @return {BufferGeometry}
     */
    static mergeBufferGeometries(geometries: Array<BufferGeometry>, useGroups?: boolean): BufferGeometry | null;
    /**
     * @param {Array<BufferAttribute>} attributes
     * @return {BufferAttribute}
     */
    static mergeBufferAttributes(attributes: any): BufferAttribute | null;
}