Importing multiple features in Angular

[UPDATE]: Oops, my mind is a bit muddled from fatigue and I've mixed up two ideas which resulted in a rather meaningless question... Let's just blame it on the coffee! :P



This may not be a pressing issue but more of a quest for knowledge...

I'm currently working on an angular web application and as I delved into testing, I noticed that many tests were failing because I had not included the components in the component-name.ts file despite importing them in app.module.ts, yet I was still calling these custom components.
(For example: 

<app-menu></app-menu>
or 
<router-outlet></router-outlet>
)

The solution seems simple enough - just import the modules and everything would work smoothly. But this raised a thought in my mind... Is it really necessary for performance to import them all?
How does Angular handle re-importing the same thing multiple times?
Would Angular remove the duplicate imports during the compilation phase or simply ignore them?

angulartypescriptoptimizationimportredundancy

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