Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

a library to minify CSS and Js sources

A Java to TypeScript/JavaScript Open Transpiler

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Apache Flex FlexJS: Compiler: Compiler JX

Common Servlet/JSP Functionality

Build utility with build tools that can also watch the same tasks.

A custom compiler pass that removes extra soy templates.

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