Executing JavaScript in Selenium in Node.js :

​​https://www.softpost.org/selenium-with-node-js/executing-javascript-in-selenium-in-node-js/​​

JavaScriptExecutor in Selenium WebDriver With Examples:

​​https://www.softwaretestingmaterial.com/javascriptexecutor-selenium-webdriver/​​

ES6 Promises :

​​https://www.datchley.name/es6-promises/​​