VScode client broken

[Cypher1]

The normal set up steps.

sigh languageServer --install
npm install:vscodeclient

Do not work, tracking this down, I have found that tsc fails to compile the package with:

node_modules/@types/node/index.d.ts:170:11 - error TS2300: Duplicate identifier 'IteratorResult'.

This leads to the following TS issue:
microsoft/TypeScript#32333

Which suggests upgrading packages, there also seem to be other packages missing from the client's node_modules directory. I will investigate further.

In future, I'd like to avoid this kind of breakage by having the language server and client built and tested on Travis. I plan to look into doing this without increasing the travis build times (e.g. by installing vscode).