What causes the "Xxxx is not a constructor" error when including a class via require in Node.js?

Question

JavaScript

Hello!
I ran into a problem, for some reason the class connected via require is written to a constant as an object:

const LietnerBox = require('../entities/LietnerBox');

As a result, I get the error "LietnerBox is not a constructor" when I try to instantiate an object of this class.
Note that the RepeatResult class is also included, but it is defined as a class and does not cause problems.

If you connect the class inside the method, then the problem disappears.

const RepeatResult = require("../dto/RepeatResult");
// const LietnerBox = require('../entities/LietnerBox'); //получаю ошибку "LietnerBox is not a constructor"

class CardMover {
...
    /**
     * @param repeatResult {RepeatResult}
     * @return {LietnerBox}
     */
    _getNextBox(repeatResult) {
        const LietnerBox = require('../entities/LietnerBox'); //код выполняется корректно
        return new LietnerBox(1);
    }
...
}

module.exports = CardMover;

Tell me why and what are the nuances of using require in Node.js?

LietnerBox class file

class LietnerBox {

    /**
     * @param num {Number}
     */
    constructor(num) {
        this._num = num;
        ...
    }
    ...
}

module.exports = LietnerBox;

Answer 1

Dear Lynn "Coffeeman" , turned out to be right!

Lynn "Coffee Man" :
Wangyu cyclical addiction

The fact is that require in JS is not the same as import in java, or use in php.
It turns out that classes in JS cannot be imported for each other.

Answer 2

for me, all connections should be at the beginning of the file, using the requester in the method is bad code.
I want to beautifully decompose into patterns, look in the direction of the composition.