“Over the last two years, we have been working on creating an updated editor and debugger based on Visual Studio Code, which is often ranked as one of the most popular developer environment tools for programmers. Furthermore, we open sourced the code of this extension to Github after its release.”

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Read More about this project and the background on the AutoCAD Blog.
https://blogs.autodesk.com/autocad/autocad-open-source-project-for-autolisp/