AFAIK none of these are valid javascript, event assuming ES6:
* class-level variables (resolved as instance variables)
* field visibility
* initializer constructors (constructor without a body automatically assigning to a field)
* enum types
That is, you can't remove type annotations (and `interface` declarations which can probably get a pass) and end up with valid JS, which seems to be what flow yields.
AFAIK none of these are valid javascript, event assuming ES6:
* class-level variables (resolved as instance variables)
* field visibility
* initializer constructors (constructor without a body automatically assigning to a field)
* enum types
That is, you can't remove type annotations (and `interface` declarations which can probably get a pass) and end up with valid JS, which seems to be what flow yields.