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1) I had first implemented  the requirement with both classes in the same file. however, when I split them into dedifferent modules,
I had some issue running it on browser since both `commonJS` and `amd` could import/define  to bundle the module.
So, I have mae some google search and I came across `systemJs` module loader, that fixed my issue in browser.

2) About the following requirement `Also make sure that the executions of updateShipment with the same id never run concurrently`.
I wasn't to share if the requirement was to pause the execution of the function and wait until the promise is returned ( I implemented that with async await).
Or it was a request to check the `id value` of the coming update (which I dont implement).

Should you have any technical questions about my submittion, please let me know.

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/*===================================== OVERVIEW ================================
 * This Function will recieve to arrays as parameters
 * and return a boolean.
 *
 * ==================================== PARAMS ==================================
 * arraySet  	  --> 1st parameter that contains an array of elemnts
 * arraySubset  --> 2nd parameter that contains the array that we are going 
 *                  to check if it is inside of the array from param1 or not.
 *				
 *

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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console