JavaScript – window.scroll({ behavior: ‘smooth’ }) not working in Safari

Use smoothscroll polyfill (solution for all browsers), easy applicable and lightweight dependency:
https://github.com/iamdustan/smoothscroll

Once you install it via npm or yarn, add it to your main .js, .ts file (one which executes first)

import smoothscroll from 'smoothscroll-polyfill';
// or if linting/typescript complains
import * as smoothscroll from 'smoothscroll-polyfill';

// kick off the polyfill!
smoothscroll.polyfill();