How to disable unnecessary modules for testing in an Angular 4 project?

Question

Angular

Noob in Angular.
I killed half a day to understand just how AngularJS differs from Angular and how to work with this npm in general.
Now I have 4 incomprehensible config files in the project folder (WebStorm -> Create -> Angular, all settings are by default)
And now I don’t want testing and all this, but simply deleting it from Package.json does not solve the issue.
Please tell me what each file is specifically responsible for and how to clean the directory.