It appears Babel is baked into Atom:
I create a .js file, and I add the following:
/** @babel */ var foo = () => console.log('foo');
I hit save, and nothing appears to happen. The fat arrow function remains in the original file, and no new transpiled file is created.
Ideally, I would like to retain my es6 source file, and generate a separate transpiled file in another directory. Is that possible?