three.js/src/Three.Legacy.d.ts

import { Geometry } from './core/Geometry';
import { Material } from './materials/Material';
import { Object3D } from './core/Object3D';
import { Scene } from './scenes/Scene';

export namespace SceneUtils {
	export function createMultiMaterialObject(
		geometry: Geometry,
		materials: Material[]
	): Object3D;
	export function detach( child: Object3D, parent: Object3D, scene: Scene ): void;
	export function attach( child: Object3D, scene: Scene, parent: Object3D ): void;
}

/**
 * @deprecated Use an Array instead.
 */
export class MultiMaterial extends Material {

	constructor( materials?: Material[] );

	readonly isMultiMaterial: true;

	materials: Material[];

	toJSON( meta: any ): any;

}

/**
 * @deprecated Material.vertexColors is now a boolean.
 */
export enum Colors {}
export const NoColors: Colors;
export const FaceColors: Colors;
export const VertexColors: Colors;