Google's Closure compiler, for optimizing and transpling JavaScript, no longer needs Java to run. Instead, Java source code is compiled to JavaScript so it can run under Node.js or in a browser. Java-dependent Closure had been introduced by Google in 2009.
The experimental release detailed this week supports ECMAScript 2015 features like arrow functions and let and const, and it provides polyfills for some ES2015 methods. It will check both syntax and types, and will provision warnings for JavaScript "gotchas." Google cautions, though, that some features are not available, and performance may not equal the Java version.
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