In the past several years I haven't seen a non-trivial app built without some kind of a build system, but I'm sure there are folks who don't use them.
Why are you asking? Learning how to use webpack (for example) can be difficult depending on your background, but once you set everything up it's pretty solid. Plus you could use boilerplates like create-react-app if you're not willing to invest too much time into figuring it out.
Why are you asking? Learning how to use webpack (for example) can be difficult depending on your background, but once you set everything up it's pretty solid. Plus you could use boilerplates like create-react-app if you're not willing to invest too much time into figuring it out.