import type { AnyStructure } from './';
import type { BufferGeometry, Material, Scene } from 'three';
import { Color } from 'three';
export declare function has_color_property(mat: Material): mat is Material & {
    color: Color;
};
export declare function extract_bond_color_for_instance(geometry: BufferGeometry, instance_idx: number): Color | null;
export declare function clean_geometry_for_export(geometry: BufferGeometry): void;
export declare function generate_mtl_content(scene: Scene): string;
export declare function create_structure_filename(structure: AnyStructure | undefined, extension: string): string;
export declare function structure_to_xyz_str(structure?: AnyStructure): string;
export declare function structure_to_cif_str(structure?: AnyStructure): string;
export declare function structure_to_poscar_str(structure?: AnyStructure): string;
export declare function structure_to_json_str(structure?: AnyStructure): string;
export declare const STRUCT_TEXT_FORMATS: {
    readonly json: {
        readonly to_str: typeof structure_to_json_str;
        readonly ext: "json";
        readonly mime: "application/json";
    };
    readonly xyz: {
        readonly to_str: typeof structure_to_xyz_str;
        readonly ext: "xyz";
        readonly mime: "text/plain";
    };
    readonly cif: {
        readonly to_str: typeof structure_to_cif_str;
        readonly ext: "cif";
        readonly mime: "chemical/x-cif";
    };
    readonly poscar: {
        readonly to_str: typeof structure_to_poscar_str;
        readonly ext: "poscar";
        readonly mime: "text/plain";
    };
};
export type StructTextFormat = keyof typeof STRUCT_TEXT_FORMATS;
export declare function export_structure_as(fmt: StructTextFormat, structure?: AnyStructure): void;
export declare function export_structure_as_glb(scene: Scene | null, structure: AnyStructure | undefined): void;
export declare function export_structure_as_obj(scene: Scene | null, structure: AnyStructure | undefined): void;