I think everyone will need a bit more context around what you do know prior to answering the question. Front-end development has somewhat quieted down from the crazy pace of the past few years -- or maybe I just settled into a stack and have given up, who knows!

But a lot of the major players (e.g, Webpack/React/Angular[!2]/TypeScript/etc) have all been around for more than a year, so context is important.