White dwarfs still produce light as thermal energy slowly leaks out into space. About 1000 white dwarfs have been observed. Since all the stuff with electrical charge is gone its now possible to squeeze everything even tighter together. One teaspoon of this stuff weighs a billion tons. It is their degeneracy pressure which now supports the star.
Neutron stars are very strange places.
A 1.4 solar mass star would only be 10 km across. To NY City - Neutron stars are not much larger than many of the Earth's major cities. In this fanciful comparison, a typical neutron star sits alongside Manhattan Island. An atmosphere of gas surrounds a crystal crust. Gravity has a maniacal grip on the star.