Closure's Achilles' heel is that it's written in Java. It's well-integrated into the stack at Google, but independent JS developers are often skeptical of tool

Closure's Achilles' heel is that it's written in Java. It's well-integrated into the stack at Google, but independent JS developers are often skeptical of tools that require more than `npm install`. It's been recently cross-compiler to JavaScript, so it is now available via npm.