How to detect collision between 3D shapes with three.js?

Question

Does anyone know to detect collision between two or more object in three.js?

I've been looking for ways on how to detect collision between object with three.js for a long time and i can't find a way to detect the collision between objects properly.If anyone knows how to do this in a simple and easy way, i would really appreciate it if you leave a comment explaining how.

Here's the code in which i want to implement collision detection:
https://code.sololearn.com/WA14A13A9a80/?ref=app