anchor.diff:  testJsCall() {
     final String source = r"""
       import 'dart:foreign';
  +    import 'dart:interceptors';
   
       class A {}
       class B extends A {}
  
positive.code: 
        var a = JS('', '1');
        var b = JS('Object', '1');
        var c = JS('=List', '1');
        var d = JS('String', '1');
        var e = JS('int', '1');
        var f = JS('double', '1');
  
negative.code:   class Object {}
    class Function {}
    abstract class List<E> {
      factory List([int length]) {
        return JS('JSExtendableArray', r'new Array(#)', length);
      }
    }
    abstract class Map<K, V> {}
    class Closure {}
  