Check ember app with google closure

I would like to check an ember app with the google closure compiler (I'm not interested in minimizing).

I call the compiler like this:

java -jar compiler-latest/compiler.jar --language_in=ECMASCRIPT6 
    --language_out=ES5 --checks-only  --manage_closure_dependencies app

But that setting seems to skip JSDOC based type checking, since the following code does not trigger any error:

/**
 * Returns the ID of the last item.
 * @return {number} The ID.
 */
 test: function() {
   return "a";
},