$ sudo apt-get update
$ sudo apt-get install libjavascriptcoregtk-4.0-18 

libjavascriptcoregtk-4.0-18 is installed in your system.

Make ensure the libjavascriptcoregtk-4.0-18 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libjavascriptcoregtk-4.0-18 *

You will get with libjavascriptcoregtk-4.0-18 package name, version, architecture and description in a table

libjavascriptcoregtk-4.0-18 package basic information: