Create a Class to be used on controllers

I want to create a Class and make it available on my controllers. I don't want to use helpers in this particular case because I'm planning to create an npm package later with this code. I don't want to create a package now, because I don't want my code to be public.

I've tried adding this code inside a file in the hooks folder:

console.log('Hook executed!');

module.exports = class Test {
    constructor() {
        console.log('Object created!');
    }
}

Then in a random controller:

const test = new Test();

The hook it's being loaded but then I'm getting:

ReferenceError: Test is not defined

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