libmozjs-52-dev 52.9.1-0ubuntu0.18.04.1 (i386 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.