• npm run build works
  • npm run test works

The following works,

  1. Open ./project-c/src/index.ts
  2. Hover cursor over b.bar()
  3. The correct type declaration appears in a tooltip

The following does not work,

  1. Open ./project-c/src/index.ts
  2. Right-click on bar
  3. Click "Go to Definition"
  4. An error of "No definition found for 'bar'" pops up instead
TS 3.0.1

== VS Code ==
Version: 1.25.1
Commit: 1dfc5e557209371715f655691b1235b6b26a06be
Date: 2018-07-11T15:40:20.190Z
Electron: 1.7.12
Chrome: 58.0.3029.110
Node.js: 7.9.0
V8: 5.8.283.38
Architecture: x64