I added some TypeScripts typings to a .net core project in Visual Studio 2015  (version 14.0.25123.00 Update 2), by using the NPM package “typings”, but the added *.d.ts files, were not picked up by Visual Studio, this was caused by excluding the “wwwroot” folder in the tsconfig.json,

after removing the wwwroot folder from the exclude array, the typings were correctly found and used.

{
  "compileOnSave": true,
  "compilerOptions": {
    "module": "system",
    "noImplicitAny": false,
    "noEmitOnError": true,
    "removeComments": false,
    "sourceMap": true,
    "target": "es6"
  },
  "exclude": [
    "node_modules",

     "wwwroot" <========================= Remove the wwwroot
  ]
}