"Missing color mapping: ansi-white" in console

Created by: gaearon

Started seeing this on master:

screen shot 2017-05-11 at 6 17 51 pm

I get this when I revert https://github.com/facebookincubator/create-react-app/pull/1842/commits/04dcef1a50e9843e333419a2abd6ab19621a7b83 and try to cause some React warnings.