Merge pull request #16792 from Mugen87/dev34

JSM: Added module and TS files for legacy loaders.

Author: Mugen87

docs/manual/en/introduction/Import-via-modules.html

@@ -169,6 +169,12 @@ <h2>Importable Examples</h2>
 				</li>
 				<li>loaders
 					<ul>
+						<li>deprecated
+							<ul>
+								<li>LegacyGLTFLoader</li>
+								<li>LegacyJSONLoader</li>
+							</ul>
+						</li>
 						<li>3MFLoader</li>
 						<li>AMFLoader</li>
 						<li>AWDLoader</li>

examples/js/loaders/deprecated/LegacyGLTFLoader.js

@@ -1073,7 +1073,6 @@ THREE.LegacyGLTFLoader = ( function () {
 	GLTFParser.prototype.loadTextures = function () {
 
 		var json = this.json;
-		var extensions = this.extensions;
 		var options = this.options;
 
 		return this._withDependencies( [

examples/jsm/loaders/deprecated/LegacyGLTFLoader.d.ts

@@ -0,0 +1,27 @@
+import {
+  AnimationClip,
+  Camera,
+  LoadingManager,
+  Scene
+} from '../../../../src/Three';
+
+export interface GLTF {
+  animations: AnimationClip[];
+  scene: Scene;
+  scenes: Scene[];
+  cameras: Camera[];
+}
+
+export class LegacyGLTFLoader {
+  constructor(manager?: LoadingManager);
+  crossOrigin: string;
+  manager: LoadingManager;
+  path: string;
+  resourcePath: string;
+
+  load(url: string, onLoad: (gltf: GLTF) => void, onProgress?: (event: ProgressEvent) => void, onError?: (event: ErrorEvent) => void): void;
+  setPath(path: string): this;
+  setResourcePath(path: string): this;
+  setCrossOrigin(value: string): this;
+  parse(data: ArrayBuffer | string, path: string, callback: (gltf: GLTF) => void): void;
+}