constructor call. Method cannot be called on T.

[cameron-martin]

If I try to typecheck the following code:

function construct<T>(constructor: Class<T>): T {
  return new constructor();
}

I get the following error:

 88:   return new constructor();
              ^^^^^^^^^^^^^^^^^ constructor call. Method cannot be called on
 88:   return new constructor();
                  ^^^^^^^^^^^ T

It seems like this code should be valid.

[vkurchatkin]

Flow has now way of knowing what arguments should be passed to constructor

[cameron-martin]

Good point. For my use, this will never be able to be safe (probably without dependent types), so I had to cast constructor to any.

[vkurchatkin]

@cameron-martin See: #1409. To avoid any you can pass factory function instead of constructor