tsc option declarationDir must be ignored

[kyasbal]

Motivation

My project contains following compilerOptions in tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "module": "es6",
    "noImplicitAny": false,
    "declaration": true,
    "moduleResolution": "node",
    "outDir": "./lib",
    "declarationDir": "./ref"
  }
}

By using this config, typedoc would produce following error.

$ typedoc --out ./docs/ ./src/

Using TypeScript 2.2.1 from /Users/kyasbal/****/core/node_modules/typedoc/node_modules/typescript/lib
Error: Option 'declarationDir' cannot be specified without specifying option 'declaration'.

npm ERR! Darwin 16.4.0
npm ERR! argv "/Users/kyasbal/.nvm/versions/node/v7.3.0/bin/node" "/Users/kyasbal/.nvm/versions/node/v7.3.0/bin/npm" "run" "doc"
npm ERR! node v7.3.0
npm ERR! npm  v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! *** doc: `typedoc --out ./docs/ ./src/`
npm ERR! Exit status 4
npm ERR!
npm ERR! Failed at the *** doc script 'typedoc --out ./docs/ ./src/'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the *** package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     typedoc --out ./docs/ ./src/
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs ***
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls ***
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/kyasbal/***/core/npm-debug.log

Solution

I inspected what is occur in passing tsc compiler options. And, I've found the source to ignore several compilerOptions.
The option declaration was ignored. But, declarationDir was not ignored.
This is the cause of this problem.

[blakeembrey]

Can you please remove this change?