TSServer Protocol.d.ts Diagnostic Interface Does Not have a Category Field #15237

TypeScript Version: 2.3.1-insiders0416

From microsoft/vscode#24907

Bug
In typescript.d.ts, the Diagnostic interface has a category field. This does not seem to be exposed in the Diagnostic defined in protocol.d.ts for the tsserver. I also do not see this field sent by the tsserver

//cc Erich Gamma (@egamma)