node js cómo ejecutar otro ejemplo de código de archivo

Ejemplo: nodo importar todas las funciones del archivo

//we are in ./utils/dbHelper.js, here we have some helper functions
function connect() {
  // connect do db...
}

function closeConnection() {
  // close connection to DB...
}

//let's export this function to show them to the world outside
module.exports = {
  connect(),
    closeConnection()
};

// now we are in ./main.js and we want use helper functions from dbHelper.js
const DbHelper = require ('./utils/dbHelper'); // import all file and name it DbHelper
DbHelper.connect(); // use function from './utils/dbHelper' using dot(.)

// or we can import only chosen function(s)
const { connect, closeConnection } = require ('./utils/dbHelper');
connect(); // use function from class without dot

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