Out of the things you mentioned I think the following make totally sense to be included in a language runtime like this:

JavaScript runtime (obviously), package manager, test runner for unit tests, bundler, JSX, SQLite bindings, formatter, linter, YAML and TOML parsers. Maaaaybe even a Markdown parser and HTML5 parser. Definitely JSON, CSV and XML parsers.

I.e. similar to Python. Though Python is a bit of an incoherent mess. If you have all these you need them to be coherent.