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js-debug is the built-in JavaScript debugger for VS Code, and is also shared with Visual Studio proper. At the time of writing, this is one of the projects I currently work on actively. It leverages the Chrome Devtools Protocol to debug Chrome, Edge, React Native, Blazor, and any other CDP-speaking target.

This debugger is a 'cleanroom' implementation which is the latest in a couple generations of debuggers in VS Code and VS over the years. The primary conceptual shift the debugger takes over previous generations is the notion of 'multi-target' debugger, which lets it deal with things like child processes, worker threads, web workers, service workers, and iframes.

It also brings a fresh focus on user experience, and a slew of other improvements such as profiling, deminification, and easier entry points for new users.