>>>
class FooConstructor {
  FooConstructor(Object bar)
      : foo = (bar == null)
          ? 'bar is null this is a very long string that causes a split'
          : bar.myField;
}
<<<
class FooConstructor {
  FooConstructor(Object bar)
      : foo = (bar == null)
            ? 'bar is null this is a very long string that causes a split'
            : bar.myField;
}