Background section in manifest with background script

background.js

/* Create background.js and add this code into it */
chrome.runtime.onInstalled.addListener((details) => {
 console.log('previousVersion', details.previousVersion)
});
console.log('Event Page for Page Action');

manifest.json

/* Add this to manifest file to use our backgroud script */
"background": {
   "scripts": ["scripts/background.js"]
}