three.js/src/loaders/MaterialLoader.d.ts

import { Loader } from './Loader';
import { LoadingManager } from './LoadingManager';
import { Texture } from './../textures/Texture';
import { Material } from './../materials/Material';

export class MaterialLoader extends Loader {

	constructor( manager?: LoadingManager );

	textures: { [key: string]: Texture };

	load(
		url: string,
		onLoad: ( material: Material ) => void,
		onProgress?: ( event: ProgressEvent ) => void,
		onError?: ( event: Error | ErrorEvent ) => void
	): void;
	setTextures( textures: { [key: string]: Texture } ): this;
	parse( json: any ): Material;

}