There is Object.assign() polyfill coming with esri/views/SceneView module (inside the esri/views/3d/canvas3d/webgl-engine/lib/es6-shim submodule).
This polyfill seems to be wrong.
According the https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign, the Object.assign() should be able to process multiple sources, which the Object.assign() polyfill coming with esri/views/SceneView does not support.
Example:
Object.assign({}, {a:1}, {b:2}); // should return {a:1, b:2}, the polyfill returns {a:1}.
You can try the example alive:
1. Open http://developers.arcgis.com/javascript/beta/sample-code/source-code/3d/basic3d/index.html in Chrome (Chrome does not implement the Object.assign() yet, so the polyfill will be used)
2. Run Object.assign({}, {a:1}, {b:2}); in the console
3. The result is {a:1}
4. Open http://developers.arcgis.com/javascript/beta/sample-code/source-code/3d/basic3d/index.html in Firefox (Firefox already implements Object.assign() since v34)
5. Run Object.assign({}, {a:1}, {b:2}); in console
6. The result is {a:1, b:2}
Generally I do not think it is good idea to pollute global scope with polyfills coming with EsriJS library itself.
