From https://code.visualstudio.com/docs/remote/faq#_why-arent-the-remote-development-extensions-or-their-components-open-source https://code.visualstudio.com/do

From https://code.visualstudio.com/docs/remote/faq#_why-arent-the-remote-development-extensions-or-their-components-open-source https://code.visualstudio.com/docs/remote/faq#_why-arent-the... : "The Visual Studio Code Remote Development extensions and their related components use an open planning, issue, and feature request process, but are not currently open source. The extensions share source code which is also used in fully managed remote development services like GitHub Codespaces and their related extensions. Given that these services also will support other proprietary products (for example Visual Studio IDE), the extensions are available under a Microsoft pre-release license like other service-based, cross-product extensions such as Visual Studio IntelliCode and Visual Studio Live Share were during their preview periods."