This is highly experimental!
Ensure that you have npm installed globally; this doesn't use the distribution provided by Pigweed yet.
Open the pigweed/pw_ide/vscode directory directly in Visual Studio Code.
Run npm install to add all dependencies.
Run “Run Extension” in the “Run and Debug” sidebar, or simply hit F5. A new Visual Studio Code window will open with the extension installed.
Make changes. The build will update automatically. Click the little green circle-with-an-arrow icon at the top of your development window to update the extension development host with the new build.
Install the build tool: npm install -g @vscode/vsce
Build the VSIX: vsce package