A particular framework version usually depends on a particular version of build tools, and those are written to a particular release of an OS. When apple update

A particular framework version usually depends on a particular version of build tools, and those are written to a particular release of an OS. When apple updates Xcode the compiled npm packages often have to update support as well, and the old versions of those packages start breaking on new OS releases. You can’t ship a web app that you can’t build. An often used hack is containerizing the dev setup to decouple from OS versions, but that comes with its own set of downsides.