Angular2 - Compiled Files in their own folder

index.html

 <script>
      System.config({
        packages: {        
          build: { //name must match folder
            format: 'register',
            defaultExtension: 'js'
          }
        }
      });
      System.import('build/boot') //import must match folder
            .then(null, console.error.bind(console));
    </script>

tsconfig.json

{
  "compilerOptions": {
    "target": "ES5",
    "module": "system",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false,
    "outDir": "./build/" //output folder
  },
  "exclude": [
    "node_modules"
  ]
}