Babylon's viewer assets package contains all needed binary assets need for the proper operation of the viewer's templating system.
This package is only needed when installing the viewer's npm package and it is installed and used automatically.
For basic and advanced viewer usage instructions please read the doc at https://doc.babylonjs.com/features/featuresDeepDive/babylonViewer/viewerExamples
The source code can be found at https://github.com/BabylonJS/Babylon.js/tree/master/packages/tools/viewer
To override the package, for example when using webpack, define the package babylonjs-viewer-assets
in "externals":
externals: {
"babylonjs-viewer-assets": true
}