This talk happened back in April but if you haven’t seen it then I would highly recommend it. It’s easily the most important front-end talk of 2019
“Modern JavaScript frameworks are all about reactivity. Change your application’s state, and the view updates automatically. But there’s a catch — tracking state changes at runtime adds overhead that eats into your bundle size and performance budgets. In this talk, we’ll discover an alternative approach: moving reactivity into the language itself. Your apps have never been smaller or faster than they’re about to become.”