title: JavaScript "compilers"
body: <p>Recently I found such cool thing as <a href="https://developers.google.com/closure/compiler/">Google Closure Compiler</a>. Are there alternatives which provide opportunities to get benefits of compiled statically-typed languages?</p>
  
  <p><em><strong>Update</em></strong></p>
  
  <p>It is not about real compilers, it is about JavaScript-JavaScript translators, which provide types verification etc, optimization, and maybe compression.</p>