Self Executing Function

cart.js

// Self executing function base form
const CartOps = (function(injectedDependency) {
  // public (see api)
  const config = {
    selectors: {
      addToCartForm: '.add-to-cart-form',
    },
  };
  
  // private (missing from api)
  const injDep = injectedDependency;
  
  // run init tasks SEF way (like a constructor)
  (function() {
    console.log('running'); 
  })();
  
  /*
   * Please comment your methods
   * Docbloc is preferred but anything counts :)
   * @param {string} message the message to dump
   * @return {bool} true always returns true
   */
  const dump = function(message) {
    // Use dependency - OK, possibly not pure
    injDep.run();
    
    console.log(config.selectors.addToCartForm + ' ' + message); 
    return true;
  };
  
  // Expose your API (if needed). But go with full private then expose what really needed
  return { 
    dump, 
    config 
  };
})($);

// CartOps.dump('message');
// CartOps.config.selectors.addToCartForm; // access config from outside