Immutable Object pattern with JS Module

Immutable.js

class Immutable {
	constructor(val) {
		this._val = val;
	}
	get val() {
		return this._val;
	}
}

function of(val) {
	return new Immutable(val);
}

export default { of };

main.js

import Immutable from './Immutable';

const immutable = Immutable.of('test value');
console.log(immutable.val);  // test value