Overview

nodejs

• require and module.exports are nodejs keywords, not javascript
• when using nodejs native keywords, there is no need to include 'type': module in package.json

javascript (es6)

• import and export are javascript keywords, not nodejs.
• Therefore you'll need to set 'type': module in package.json

commonjs

• commonjs is already incorporated inside Nodejs, where the keywords module.exports and require are used:

  const myModule = require("store/customer");
  function main() {
    myModule.listCustomer();
  }
  
  module.exports = main;