I’m not sure I understand your question, but a quick answer would be to import these. js in your app.js, but I don’t know if that’s all you want, so it follows a nice structure that I adopted when I work with Vue.js in Lisbon:
Resources/Assets/js/classes
You get all the javascript classes you need, for example:
- Form js.
 
- Utils.js
 
- Errors.js
 
- ...
 
Each class is registered globally within itself:
- window. Form = Form;
 
- window. Utils = Utils;
 
- window. Errors = Errors;
 
- ...
 
Example:
export default class Form
{
    constructor(data)
    {
       ...
    }
    reset()
    {       
       ...
    }
    data()
    {
       ...
    }
    submit(method, endPoint)
    {
       ...
    }
    onSuccess(data)
    {
        ...
    }
    onFail(error)
    {
       ...
    }
}
window.Form = Form;
In the Resources/Assets/js/app.js occurs the import of these classes:
- import Form from './classes/Form';
 
- import Utils from './classes/Utils';
 
- import Errors from './classes/Errors';
 
- ...
 
At the same time, in the app js. Vue.js is instantiated together with its components, which are in Resources/Assets/js/Components, example:
Vue.component('menu-row', require('./components/MenuRow.vue'));
Vue.component('menu-form', require('./components/MenuForm.vue'));
// Root instance
const app = new Vue({
    el : '#app'
});
So you have the freedom to create your javascript classes, and use them in the Vue.js components quietly
							
							
						 
This may help, https://medium.com/laravel-news/advanced-front-end-setup-with-vue-js-laravel-e9fbd7e89fe2
– Miguel