Magento 2: Adding a Javascript library

I am trying to add an animation library called Sal, built on pure Javascript (Does not rely on jQuery). Maybe I am missing something, but I followed the instructions on adding via require-config, and I am getting a sal is not defined error.

I have also tried just adding the js file via default_head_blocks.xml

My require-config.js

var config = {
    paths: {
        'sal': 'js/sal'
    },
    deps: [
        "js/script",
        "js/main"
    ]
};

My main.js

define(['sal'], function(){
  "use strict";
  sal();
  console.log(" ====== main.js is loaded====== ");
});