Typically, Go developers use GopherJS or similar tools to transpile Go code into JavaScript rather than implementing a JavaScript engine within Go itself. This approach allows Go developers to leverage their existing skills and codebase while utilizing JavaScript for certain aspects, such as frontend development.

If "ProgpJS" is a project or development that has emerged more recently, I recommend checking online sources, GitHub repositories, or official project documentation for the most up-to-date information. Always verify the latest details to ensure accuracy and relevance to your needs.