[dbbk]

Out of interest, have you looked into EmberJS? That has by far the smoothest upgrade process I've come across. One CLI command upgrades your dependencies, does a diff against a new greenfield project and applies the changes to your application, and also runs any codemods to migrate your code to a new pattern.

[alceta]

I did not look into it mainly because we cannot afford a rewrite, and the ngUpgrade module provided us with a way to write new code without replacing everything in one go (and breaking the entire frontend in between).