title: index.ts is not part of the compilation output
body: <p>I am trying to compile my Angular application and am getting an error.
  It seems to be with the compiler not recognizing the index.ts file. I'm not sure why.</p>
  
  <p>Below is the error:</p>
  
  <pre><code>ERROR in ./node_modules/datatable/index.ts
  Module build failed: Error: node_modules\datatable\index.ts is not part of the compilation output. Please check the other error messages for details.
      at AngularCompilerPlugin.getCompiledFile (node_modules\@ngtools\webpack\src\angular_compiler_plugin.js:629:23)
      at plugin.done.then (node_modules\@ngtools\webpack\src\loader.js:467:39)
      at process._tickCallback (internal/process/next_tick.js:103:7)
   @ ./src/main/ui/app/app.module.ts 13:0-59
   @ ./src/main.ts
   @ multi webpack-dev-server/client?http://0.0.0.0:0 ./src/main.ts
  ERROR in ./node_modules/typeahead/index.ts
  Module build failed: Error: node_modules\typeahead\index.ts is not part of the compilation output. Please check the other error messages for details.
      at AngularCompilerPlugin.getCompiledFile (\node_modules\@ngtools\webpack\src\angular_compiler_plugin.js:629:23)
      at plugin.done.then (node_modules\@ngtools\webpack\src\loader.js:467:39)
      at process._tickCallback (internal/process/next_tick.js:103:7)
   @ ./src/main/ui/app/app.module.ts 12:0-59
   @ ./src/main.ts
   @ multi webpack-dev-server/client?http://0.0.0.0:0 ./src/main.ts
  </code></pre>
  
  <p>Does anyone have any suggestions on how to fix this?
  Thank you.</p>