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

import { LoadingManager } from './LoadingManager';

/**
 * Interface for all loaders
 * CompressedTextureLoader don't extends Loader class, but have load method
 */
export interface AnyLoader {
	load(
		url: string,
		onLoad?: ( result: any ) => void,
		onProgress?: ( event: ProgressEvent ) => void,
		onError?: ( event: ErrorEvent ) => void
	): any;
}

export interface LoaderHandler {
	handlers: ( RegExp | AnyLoader )[];

	add( regex: RegExp, loader: AnyLoader ): void;
	get( file: string ): AnyLoader | null;
}

export class FileLoader {

	constructor( manager?: LoadingManager );

	manager: LoadingManager;
	mimeType: MimeType;
	path: string;
	responseType: string;
	withCredentials: string;

	load(
		url: string,
		onLoad?: ( response: string | ArrayBuffer ) => void,
		onProgress?: ( request: ProgressEvent ) => void,
		onError?: ( event: ErrorEvent ) => void
	): any;
	setMimeType( mimeType: MimeType ): FileLoader;
	setPath( path: string ): FileLoader;
	setResponseType( responseType: string ): FileLoader;
	setWithCredentials( value: string ): FileLoader;
	setRequestHeader( value: { [header: string]: string } ): FileLoader;

}