example of import and export module

import {sayHi as hi, sayBye as bye} from './say.js';

hi('John'); // Hello, John!
bye('John'); // Bye, John!

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code for say.js

function sayHi(user) {
    alert(`Hello, ${user}!`);
  }
  
  function sayBye(user) {
    alert(`Bye, ${user}!`);
  }
  
  export {sayHi, sayBye}; // a list of exported variables

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