{
  "devDependencies": {
    "tslint": "^3.15.1",
    "tslint-config-typings": "^0.2.4"
  },
  "scripts": {
    "lint": "tslint discord.d.ts discord.js-test.ts"
  }
}

{
  "devDependencies": {
    "tslint": "^3.15.1",
    "tslint-config-typings": "^0.2.4",
    "typescript": "^2.0.6"
  },
  "scripts": {
    "lint": "tslint discord.d.ts discord.js-test.ts"
  }
}

Add typescript as a dev dependency
Add typescript as a dev dependency
