Creating a module with interface coupled together using ES2015

module+interface.js

const myModule = ((interface) => {
    // Implementing the interface

    // This is like an interface, which doesn't pollute the main module with unrelated code
    console.log(interface.init());

    // Instantiate a new class that is attached to the interface
    const _printClass = new interface.printClass();

    return {
        // Initialise the outer module
        init: () => {
            return 'Outer module function (Public Module)';
        },

        // Print a value using the 'printClass' object reference
        print: (value) => {
            _printClass.print(value);
        },

        // Expose the underlying interface
        getInterface: () => {
            return interface;
        }
    };
})(((config) => {
    // Interface

    // Displaying the passed parameter data
    console.log(config);

    return {
        init: function () {
            return 'Inner module function (Interface)';
        },

        printClass: class {
            constructor() {
                // Empty
            }

            print(value) {
                console.log(value);
            }
        }
    };
})('Passed to inner module (Interface)'));

myModule.init();