Reading javascript file into Node as command line arguments and parsing it

Question

I'm writing an npm module that needs to take a configuration file as command line arguments. Currently I have it working with a json file like so:

const configurationObject = JSON.parse(await readFile(argv.configPath, 'utf8'));

With this I can run my module like so:

myModule --configPath "./source/to/config.json"

Now I would like to do the same, but using a .js file as the configuration file.

How do I parse that file and store the resulting object to a variable? I've looked into the npm package acorn, but parsing with acorn just gives me an AST, but I can figure out how to turn that into executable code?

// This results in a string containing the js file contents
// (readFile is fs.readFile wrapped in a Promise)
const fileInput = await readFile(argv.configPathJs, 'utf8');

// Gives me an object structure breaking down the code into an AST
acorn.parse(fileInput, {ecmaVersion: 2020});