Make Shadows appear with a certain radius from the camera

Im making a three js game engine but I have one problem, Shadows. I had a problem with shadows for quite some time in three js but I need shadows to appear where the camera’s position is at with a radius so it does not lag the engine.

I need a camera that can see shadows from a radius positioned where the camera’s position is at.

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Ima see the tutorial then

Do I just have to download the three-csm.js file and just follow installation?