My builds on AppVeyor are currently failing due to a 500 response when fetching vscode.d.ts:

npm install --depth 0 --silent
Detected VS Code engine version: ^1.17.0
Error installing vscode.d.ts: Error: Request returned status code: 500
Details: 
Command exited with code 1

The build is here: https://ci.appveyor.com/project/DanTup/dart-code/build/0.0.771

Note: I think this has only recently happened - a few hours ago I pulled this on my Mac without any issues.