Read the 2019 State of JS results - https://2019.stateofjs.com/.
Unsurprisingly, React remains top of the list of front-end frameworks. GraphQL is also incredibly popular. I’m a little disappointed that MobX hasn’t garnered more than a cult following because I think it’s an incredible state management solution. Clearly built-in React solutions have been favoured for state management (Redux is in decline but still enjoys a wide following), but I think there’s still much room to innovate here. Glad to hear your thoughts!