Having *.ts in multiple folders doesnt generate folders if you leave out the root *.ts file

[fletchsod-developer]

TypeScript Version:

1.8.29

Code

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "system",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "noEmitOnError": true,
    "outDir": "wwwroot/scripts"
    },
    "exclude": [
      "node_modules",
      "typings/main",
      "typings/main.d.ts",
      "wwwroot"
    ]
  }

Expected behavior:

Sorry if it this is a duplicate but I couldn't find one when searching for it.

Using VS-2015 Update 2, If I create this typescript files in folder (or multiple folders)

When compiling, it should produce this.

Actual behavior:

Instead it produce this

But the expected behavior would work if you add a root file instead. (The missing root file shouldn't cause this bug to begin with).

[mhegazy]

Please see documentation in https://github.com/Microsoft/TypeScript/wiki/FAQ#why-does---outdir-moves-output-after-adding-a-new-file

also see my reply in #7346 (comment)