libmozjs-38-dev 38.8.0~repack1-0ubuntu2 (arm64 binary) in ubuntu bionic

 SpiderMonkey is the code-name for Mozilla Firefox's C++ implementation of
 JavaScript. It is intended to be embedded in other applications
 that provide host environments for JavaScript.
 .
 This package contains the header files which are
 needed for developing SpiderMonkey embedders.