How to dynamically select module with modern nodeJS?

Question

I am using node --experimental-modules test.mjs (NodeJs v11.9.0).

There are many options to implement the same class, and I need to swith by terminal,

Answer 1

import ClassV1 from './MyClass-v1.mjs';
import ClassV2 from './MyClass-v2.mjs'; 
import ClassV3 from './MyClass-v3.mjs';

const classes = {
  a: ClassV1,
  b: ClassV2
}

const Class = classes[process.argv[2]] || ClassV2;

You could also write an index file with all the classes and do an import * as classes from 'classes.mjs';.