Code Review:

Also all the TS Server code is in here : https://github.com/Microsoft/TypeScript/tree/master/src/server
TSServer has its own implementation of watchFile : https://github.com/Microsoft/TypeScript/blob/master/src/server/server.ts#L201-L208 for good reasons mentioned in the comment above the code
another sample editor https://github.com/Microsoft/ngconf2015demo/blob/master/sublimetext/typescript/TypeScript.py
- class EditorClient sets up an instance of TSServer
useful read : https://github.com/Microsoft/TypeScript/blob/master/src/server/protocol.d.ts as far as I can tell it doesn't have full bidirectional communication
I only see request : client -> server response : server -> client (for a request), event : server -> client (first and forget for the server really)
It also uses readline to communicate with client : https://nodejs.org/api/readline.html : https://github.com/Microsoft/TypeScript/blob/master/src/server/server.ts#L10-L14
A nice implementation of script snapshot here : https://github.com/Microsoft/TypeScript/blob/master/src/server/editorServices.ts
Limits power significantly as you do not have the complete language service access e.g. getProgram is blocked out : https://github.com/Microsoft/TypeScript/blob/master/src/server/client.ts#L479-L485 this is vital for the next iteration of advanced features.

TSServer #91

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