he current operating system. Returns one of:

* :windows

* :mingw

* :cygwin

* :macos

* :web - Web assembly (emscripten)

* :linux

* :freebsd

* :openbsd

* :netbsd

* :dragonfly

* :bsd

* :posix - A POSIX compatible system (default)

May also return a custom keyword specified at build time.</pre><a href="https://janetdocs.org/os/which">Community Examples</a></div>
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