Nodejsの中でbabelを通してs 6文法を体験します.

npm install --save-dev @babel/core @babel/cli @babel/preset-env @babel/node
npm install --save @babel/polyfill

const presets = [
    ["@babel/env", {
        targets: {
            edge: "17",
            firefox: "60",
            chrome: "67",
            safari: "11.1"
        }
    }]
];

module.exports = { presets };

npx babel-node index.js

let a = 10;
let b = 5;
let c = 4;
let d = 6;

function show() {
    console.log('11111')
}

export default {
    a,
    b,
    c,
    show
}

import i from './test.js'
console.log(i)

{ a: 10, b: 5, c: 4, show: [Function: show] }