VIP20/18_Webpack/day-1/webpack_project/src/main.js

import './common.css';

console.log('hello, world.');

let promise = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve(1);
  }, 1000);
});

promise
  .then((result) => {
    console.log(result);
  })
  .catch((err) => {
    console.error(err);
  });