Fix Build

Viewer/src/loader/plugins/msftLodLoaderPlugin.ts

@@ -17,7 +17,7 @@ export class MSFTLodLoaderPlugin implements ILoaderPlugin {
 
     public onExtensionLoaded(extension: IGLTFLoaderExtension) {
         if (extension.name === "MSFT_lod" && this._model.configuration.loaderConfiguration) {
-            const MSFT_lod = extension as GLTF2.Loader.Extensions.MSFT_lod;
+            const MSFT_lod = extension as GLTF2.MSFT_lod;
             MSFT_lod.enabled = !!this._model.configuration.loaderConfiguration.progressiveLoading;
             MSFT_lod.maxLODsToLoad = this._model.configuration.loaderConfiguration.maxLODsToLoad || Number.MAX_VALUE;
         }