newTree.optimize is not a function

[vivek-gloify]

I'm submitting a...

[ ] Bug report  
[ ] Feature request
[ ] Documentation issue or request

In package

[ ] @ng-toolkit/init
[ ] @ng-toolkit/serverless
[ ] @ng-toolkit/universal
[ ] @ng-toolkit/pwa
[ ] @ng-toolkit/firebug

Current behavior

Expected behavior

Minimal reproduction of the problem with instructions

Example repository

What is the motivation / use case for changing the behavior?

Environment

Angular version: X.Y.Z


- Node version: XX  
- Platform:  

Others: