Imposing components when script is added to game object

I found this awhile back and saw it being used however i lost it and I cannot find it through keywords alone.
What is the script code to impose a component on a game object?

For instance, the second I attach script “NavMeshController”, I would like a NavMesh Component and a Collider to be attached as well.

I know you can check if these components exist and create a warning/error but how do I impose it?

RequireComponent

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Thank you!