模块在Laravel 5.6中不起作用

I have a problem with webpack.mix in laravel, my modules are not being recognized, i did some research for figuring out what could be happening:

• simple way to include node_modules in laravel 5.5
• installing JS packages using npm and compiling with webpack laravel mix
• How to include webpack plugins when using Laravel Mix?

This is my app.js file from resources/assets/js

console.log('Test');
require('imagesloaded')
require('jquery')
require('slick-carousel')

In the console i see 'Test', but all the other modules are not recognized, in public/js i have the init files for each module but is not working, i even try this in webpack.mix.js:

mix.js('resources/assets/js/app.js', 'public/js')
   .sass('resources/assets/sass/app.scss', 'public/css')
   .extract([
       'jquery',
       'slick-carousel',
       'imagesloaded'
    ])
    .options({
       uglify: true,
    })

And importing vendor.js.

I also tried initializing the modules in the app.js file, for initializing i mean just slick(), i also tried giving each require a variable name, and using syntax import "modulename", but nothing...

Any ideas of what could be happening?

After some trial and error with DigitalDrifer this is the app.js file working

import $ from 'jquery'
const imagesLoaded = require('imagesloaded')
const slick = require('slick-carousel')

With all the code for initializing each package inside app.js (below requiring), not in different folders, according to this that is a bad practice anyways.