import { square, diag } from 'lib';

//------ lib.js ------
export const sqrt = Math.sqrt;
export function square(x) {
    return x * x;
}
export function diag(x, y) {
    return sqrt(square(x) + square(y));
}

node --experimental-modules my-app.mjs

function myFunc() {
    console.log("Hello from myFunc")
}

export default myFunc;

import myFunc from "./myfile"

myFunc();

node  --experimental-modules  index.mjs

(node:12020) ExperimentalWarning: The ESM module loader is experimental.

Hello from myFunc

yarn add esm

npm install esm

node -r esm index.js

{
  "name": "My-app",
  "version": "1.0.0",
  "description": "Some Hack",
  "main": "index.js",
  "scripts": {
    "test": "echo "Error: no test specified" && exit 1",
    "start": "node -r esm index.js"
  },

}

npm start

// this is to allow ES6 export syntax
// to be properly read and processed by node.js application
require('babel-register')({
  presets: [
    'env',
  ],
});

// after that any line you add below that has typical es6 export syntax
// will work just fine

const utils = require('../../utils.js');
const availableMixins = require('../../../src/lib/mixins/index.js');

export { default as FormValidationMixin } from './form-validation'; // eslint-disable-line import/prefer-default-export

nodemon --inspect ./index.js --exec babel-node --presets es2015,stage-2

"devDependencies": {
    "@babel/core": "^7.2.0",
    "@babel/preset-env": "^7.2.0",
    "@babel/register": "^7.0.0"
  }

{
  "presets": ["@babel/preset-env"]
}

require("@babel/register")({})

// Import the rest of our application.
module.exports = require('./index.js')