yarn start
On whatsapp-web.js v1.22.1, after QR scanning is stucked.
In order to fix it, go to node_modules/whatsapp-web.js/src/CLient.js#175
(line 175) and replace
const INTRO_IMG_SELECTOR = '[data-testid="intro-md-beta-logo-dark"], [data-testid="intro-md-beta-logo-light"], [data-asset-intro-image-light="true"], [data-asset-intro-image-dark="true"]';
with
const INTRO_IMG_SELECTOR = 'div[role=\'textbox\']';