Install gir1.2-javascriptcoregtk-3.0 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-javascriptcoregtk-3.0
Description:
JavaScript engine library from WebKitGTK+ - GObject introspection data
JavaScriptCore is the JavaScript engine used in WebKit. It consists of the following building blocks: lexer, parser, start-up interpreter (LLInt), baseline JIT, a low-latency optimizing JIT (DFG), and a high-throughput optimizing JIT (FTL). . This build comes from the GTK+ port of WebKit (API version 3.0). . This package contains the introspection data, which can be used by packages using the GIRepository format to generate dynamic bindings.
Homepage: http://webkitgtk.org/
Version: 2.4.11-3ubuntu3
Section: universe/introspection