Use new provideIn syntax for service injection

[elvirdolic]

Would be good to have in setting to define how it should be provided, by "provideIn" syntax or legacy syntax.

[vmasek]

Hello, sorry for getting to this feature request after so long.

This would be probably related only when you integrate one big service of all the operations and do not split into multiple "micro" services (like User, Product, Order, ...).
Do I get it right that goal is to have that one service provided in 'root' ?