title: Angular2: generate metadata.json and ngsummary.json
body: <p>Dear Angular 2 developpers,</p>
  
  <p>I am struggling with finding decent documentation on the angular 2 compiler (ngc).</p>
  
  <p>What I want to do: I have a folder containing an angular 2 logging library whose entry point is a 'logging.module.ts'. So far, I have compiled it via a tsconfig file and it worked fine.</p>
  
  <p>Now, I would like to switch to the angular compiler. Yet, when I run ngc. Only *.ngfactory.ts and *.ngsummary.json files are generated.</p>
  
  <p>I cannot see any .js .d.ts or .metadata.json files. (And if I understood correctly, ngc was designed as a "drop-in replacement" for the typescript compiler).</p>
  
  <p>Any hints what I might be doing wrong?</p>
  
  <p>Thanks for your help.</p>