TS language service reported errors in fileService.ts

[bpasero]

Seems to happen since we updated to TS 2.3.x:

[bpasero]

Found another one in extfs.ts:

[bpasero]

And more in editorService.ts (browser):

[bpasero]

Fixed by changing to workspace TS version (2.2), not sure why I was on 2.3.