Download this extension from the Visual Studio Marketplace or get the CI build.
Provides language support for IDL 3 and header generation based on WinMD transformations.
Right-click any .idl file to invoke the Update Header File... command.
Doing that will result in the generation of a WinMD file followed by header file generation by using cppwinrt. All of this takes place in a temp folder, so no artifacts will be added to your project.
Once the generation is done, a merge window pops up to let you merge the updates you need into your .h file.
Click Accept Merge in the upper-left corner moves the changes you selected into the .h file in your project.
If you enjoy using the extension, please give it a ★★★★★ rating on the Visual Studio Marketplace.
Should you encounter bugs or if you have feature requests, head on over to the GitHub repo to open an issue if one doesn't already exist.
Pull requests are also very welcome, since I can't always get around to fixing all bugs myself. This is a personal passion project, so my time is limited.
Another way to help out is to sponsor me on GitHub.