There are two script hosts in the code base
- v8 - Default engine
- goja - WORK IN PROGRESS
V8 is the JavaScript engine in Chrome. It is a C++ API, and requires a lot of CGo code to work, making this library troublesome for some. However, this library is only intended for testing, not production. So your production system does not inherit a CGo dependency.
Goja is a pure Go JavaScript engine. I didn't know about this when I started. I wish I had. I'm slowly implementing support for existing features to Goja. Had I known about it, I would have used it instead of v8.
The default host is currently v8. When the goja host is ready, and all features are supported, it will become the new default.
V8 will continue to be supported. As long as V8 powers Chrome, you woulndn't use JavaScript features that are not supported in the engine.
V8 is based on the v8go project, Originally created by Github user rogchap. It wasn't kept up to date, and now Tommie's branch is the best maintained. This fork is automatically updated with the latest v8 versions from the chromium repository.
However, many v8 necessary v8 features were not implemented. I have added support for these in my own fork, and working with Tommie to get them merged into his.