Npm

Useful commands

List the packages at depth

npm list --depth 0

New Babel 7 Project

 mkdir project1
 mkdir project1/src
 cd project1
 npm init
 npm install --save-dev @babel/core
 npm install --save-dev @babel/cli
 npm install --save-dev @babel/preset-env

Create in the root .babel.rc

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

Create src/index.js

 import express from "express";
 const app = express();
 
 app.use("/", (req, res) => {
   res.status(200).send("Hello World");
 });
 
 app.listen(3000);
 
 console.log("Server running at http://localhost:3000/");
 
 export { app as default };

Make the package.json to look like this

{
  "name": "rest-api3",
  "version": "1.0.0",
  "description": "",
  "main": "src/index.js",
  "scripts": {
    "start": "nodemon src/index.js --exec babel-node"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/cli": "^7.6.4",
    "@babel/core": "^7.6.4",
    "@babel/preset-env": "^7.6.3"
  },
  "dependencies": {
    "@babel/node": "^7.6.3",
    "express": "^4.17.1",
    "nodemon": "^1.19.4"
  }
}
<source lang="json">