[kypro]

Probably a bit. Companies and recruiters will usually look to see if you have a good skill match, especially for more senior roles and having no experience with a modern frontend framework will often be seen as a negative.

If you're strong with JS and have experience writing ES6 code with something like webpack as a module bundler then I think you would be considered. Vue and React honestly aren't that complicated, there are a few things you'll need to learn like how to manage state, lifecycle hooks, etc, but if you're a good dev these things won't take you long to pick up.

If I were you I would work on some projects outside work so you can demonstrate you have at least some familiarity and competence with a framework like React. Although what I usually do when I want to learn a new language is look for a small project I can do at work with that language. Could your company use a new dashboard for something? Could you create some standalone documentation in React? Look for something simple and which is independent of your existing tech stack. It's a little cheeky, but it just tends to look a little better if you can show you've been paid to do something.

I wouldn't quit your job if you're enjoying it and happy with the pay though, just try to find a way to ensure you're not falling behind. Also keep in mind your employer should be aligned with your interests in keeping up to date with the latest tech as it benefits them to have experienced devs. Don't be afraid to advocate for modernising your tech stack and upskilling your devs!