preset-env support

So, in short, I've bumped into the following info (was even updated somewhat recently). What I wanna know: is that a fact? Can someone point me to /*#__PURE__*/ annotation handles/config/settings/API? (specifically, I'm in need of what @babel/plugin-transform-react-pure-annotations does, since their absence/incorrectness is kind of detrimental to tree-shaking) Oh and, hello authors of the least rusty swc 😄