> The set of dependencies that Create-React-App uses includes:
> A compiler. a bundler/linker, an optimizing minifier, a linter, a development server with live reloading, and a test runner
All of those are isolated and scoped to that one project, and they are all build-time dependencies only. It's also important to understand that Javascript packages are effectively distributed as source, which affects the number of files on disk. (Granted, many NPM packages do include unnecessary files in the published artifacts, but Javascript itself is a major factor there.)
As you said, a full-blown IDE like XCode or Visual Studio is easily multiple gigs, and if you were to look at the actual file size on disk of any C++ compiler toolchain, that would be a minimum of dozens of MB - those are just usually preinstalled on Linux or Mac systems.
So, context is pretty important here. A couple hundred MB for a complete JS build toolchain is understandable. I don't think it's necessarily _good_, and I think it can be improved a lot (especially with upcoming tooling like NPM Tink and Yarn PnP), but it's not the catastrophe many make it out to be.