@rapropos, here are my concerns about that solution :
Even if I follow my existing project’s package.json, I wouldn’t end up with all the generated files the same way they were generated for an Ionic v4 project.
Would that not matter?
Pushing the question further (not my exact use case) : the current Ionic CLi generates an Angular 8 project while I might need an Ionic 4 project with Angular 7.