Reading all variables and other details in .mjs (module type javascript file) using Node.js

Question

I am wondering, how can I read variables names, classes names, and other stuff in .mjs file using Node.js.

I have for example file:

class AppRequestResult {
    constructor() {
        this.test = new TestRequests();
        this.subject = new SubjectRequests();
        this.question = new QuestionRequests();
    }
}

function abc() { return 2; }
function def() { return abc(); } 

const text = "sometext";

export const AppRequest = new AppRequestResult();
export const ApiUrl = `localhost/app`;

And how to retrieve:

Variables:

• text
• AppRequest (mark it as exported in result)
• ApiUrl (mark it as exported in result)

Classes:

• AppRequestResult

Functions:

• abc
• def (mark it as exported in result)

I tried to search for packages in Node.js that could do that, but I found none. Also I tried to use "import()" function in Node.js but it only displays exported things. My target is to combine all .mjs source files to one file and to do that I have to find a way to rename certain variables that are in the .mjs files and rename it to prevent "Already defined" error.